23C 



KNOWLEDGE 



[Sept. 1, 1882. 



wvathor the air ccntains more moisture tlian iu hot, and in cold 

 weather wo do not perspiro so much, as can bo scon from tho extn\ 

 amount of water otherwise removed from the system. Hot drinks 

 incn-a^e tho volume of lieot in iho body, and if that is not required, 

 we quickly p.-t rid of it by the skiu, hence much perspiration iu hot 

 weather during tea-tin\i*. 



Water is the best thirst quencher, but if simple food be taken, 

 the ne»'d of ilrinks will be very small. I know many vegetarians 

 who .! ■ n.ir .irink nnythinj» from month to month, tho only fluid 

 tti. noes of the fruits which they eat. 



•t drinks may bo taken lukcwnrra for n very 

 1 ■ little apparent damage. Tho least injurious 



i-x ilenty of milk, and allowed to stand until nearly 



ccKil. A iT"...! list is to apply the little finger to the drink, and it 

 it be not hot to it, then it may safelv bo taken. — Yours truly, 



Au.j. 4, 1SS2. T, K. Allixson, L.R.C.P., Ac. 



TIME OF FULL MOOX. 



[535]— By means of Professor Dc Morgan's " Book of Alman.icks," 

 I Imvc calculated, for your correspondent, that tho time of full moon 

 in July, 1573, was at or about 8 p.m., on Tuesday, July 14-. 



Henhy J[. 



an^fijj to Corirspontitnts!* 



thi fott. 3 Lttlcri tetiUo tltt Editor for corrfpomJtHlt 

 ■liK the namft or aJdretitt <^ correMponJentt heitiren in 

 I. 3. Corretpondent* thould writt on ont tide orly of the 

 1 a Mrparale Irof. i. J?<i<-* Itlirr thould hate a liHr, otid 



t akould b» mad* to its Hkn&rr, tht j 



D. W. TCBXEH. I am sorrj-, but thero is absolutely no space for 

 articles on the Turkish and Egyptian matters you mention. — Kev. 

 T. F. D. Thanks for pointing out shortcomings as to astronomical 

 matter. So many had said there was too much. — W. Napier. If 

 you use a Nautical Almanac tho directions will be rather complex, 

 as follows:— To make a morning tide-table for Ipswich, tako tho 

 second column of tidal hours for London from the Nautical Almanac, 

 wherever the hour in that column eiceods 13 Ii. 23m. ; and deducting 

 13 h. 23 m., you get tho morning tide hour for tho day following 

 that named. Thus you find opposite KebruaiT' 7, in second column, 

 20 h. 37 m. ; from' this deduct 13 h. £3 m., giving 7 h. 11 in. 

 This is the morning tide hour for Febru.try 8 at Ipswich. 

 ^VTien tho hour lits between 12 h. and 13 h. 23 m., deduct 

 1 h. 23 m. from tho hour in the left hand column increased by 

 12 h. This is the morning tidal hour for tho d.iy named. Thus, 

 opposito Jan. 12, 1881, you find in tho two columns Oh. 4m., 

 and 12h. 33m., tako then from 12h. 4m., Ih. 23m., giving lOh. 41m., 

 which is the morning tide hour at Ipswich on Jonu.iry 12. For tho 

 afternoon hours, take tho tidal honrs in the first column where they 

 eiceed Ih. 23m., and so get afternoon tidal hours for the day 

 named— as on Jan. 22, 1881, where Bh. 11m. is named, tho afternoon 

 tidal hour at Ipswich is 4h. 48ni. Where tho hour named in first 

 column it leys than Ih. 23m., tako the second column, and diminish 

 by Ih 2P,rr . Tluw. r..r Jan. 12, ISSl, where hour in wcond column is 

 1-" • nil. 10m. f.r the afternoon I irie at Ipswich. If, 



I" what everyone should have, a Whituker's 



A.' r all this much more simply, by taking Ih. 23m. 



'•' ■ I i^r high tide at London Uridge, in a page 



■' li month. I have given the rule for 



'' ■ i,' how early you may wish to get out 



•' I'Ki DrpKN.wB. Meteors cannot leave 



•'• I :i iilrmi-t, unless, encountering tho 



I' ii considerably diminished. 



-\ ■, wlintever effect tho planet 



" ■ .1 aids itself will generate a 



" .■ ;1." nietc-ors away from it. — 



'' "t but m till TO not some mistake ? I do not 



•I • ^"- In tho coumo of the analysis 0-' is treated 



"" ■ ■■■< i« rint r/mrt— an incorrect mathematical 



I' •■ ' ' . -W. M'Ma.mh. You think 



I* lifuir in charging 2d. for tho 



" not do the same. You aro 



'■"• lave done (for the matter was 



Iifi rv.^ r. . I. II, ,„;. l,.ir,.|.( ;.K ji, tin irs) we have l)cen very much 

 fairer than the publiahcn of other periodicals, or, rather, wr: have 

 been unfair to oancire*. Take the Engliih Ucchanie. It charges 



its subscribers (and most fairly) 2d. yearly for index j wo have 

 charged them nothing. It prices the index number ut 3d., bo thai 

 every one has to buy tho index who takes in tho Eiujlish }fechanli- 

 regularly, whether ho wants to bind the back numbers or not (and 

 not ono in six wants to do so). Our publishers supply those 

 only who want tho index. Tho index would bo very profit- 

 able if priced at ono penny, and included with a 32-page 

 number priced at 3d. ; and still more prolitablo if, as in 

 Natvre and Bomo other weeklies, it simply occupied so 

 much space in a number of tho usual size. As it is, though 

 the publishers do charge other than subscribers 2d. for tho index, its 

 publication does not cover its cost. This, 1 imagine, will satisfy your- 

 self and tho other readers you speak of. I must confess supporters 

 of that kind nro disheartening enough. A publication is started on 

 tho most generous terms to readers and contributors (I venture to 

 say no jiublication of tho sumo kind has over been started on so 

 generous a plan), yet a certain section of its readers raise objec- 

 tions on every paltry point they can think of, mostly in utter ignor- 

 ance of tho real state of things. Thus wo aro asked, after wo have 

 been in existence a certain time, to oblige some readers by pub- 

 lishing monthly parts ; the irablishers find that for tho additional 

 expenses, as well as risk iu kcopiug back so many single 

 numbers to make up parts, tho price of each monthly part must bo 

 2d. beyond the price of tho single parts included in tho month : 

 immediately an outcry is raised over this paltry 2d., which doos not 

 in reality compensate for tho cost of our attem|it to oblige monthly 

 subscribers. We are asked for an index, and the publishers imme- 

 diately make a present of it to subscribers, and charge Ihoso who 

 care to buy it sepai'ately 2d. per copy, losing money by the arrange- 

 ment, because five-sixths of tho readers of journals like this do not 

 bind. For thus bringing a loss on themselves in tiying to oblige 

 readers, they got such thanks as your letter conveys. Let me once 

 for all point out that tho object of Knowledge was to supply sound 

 and clear scientific writing by leading writers at a very low price to 

 readers, and at a bettor price than has been usual in such cases, 

 to writers. I, as editor, gave to Knowledge time and work, worth to 

 mo ten times as much as I could possibly lio])o to receive for my 

 services. I am ready to continue this j I am anxious to seo tho 

 publishers responding to every advance wo mako by giving bettor 

 and better matter to readers, better and better terms to writers. 

 They share these views with mo. Hut conceive how encouraging 

 wo find it under these circumstances to receive letters showing such 

 kindly feeling as yours, such thorough appreciation of what 

 we have tried to do. — A Stiue.nt. Much obliged, but not ono 

 in a thousand of our roadcrs would caro for quaternions. — 

 B. M. It is singular how diflienit you seem to find it 

 to understand my position. Can you not seo that I have nothing 

 to do with the cruelties of continental vivisectionists ? I have 

 reviewed what Trof. Owen has said as to his own opinions, which 

 seem to me reasonable and sound. Why should I bo guilty of tho 

 impertinence of asking him whether he abominates, as he ought tu 

 do, certain atrocities of which ho does not speak ? I tako it for 

 granted that he does, and that so also does Prof. Huxley, but to ask 

 either whether they do would simply bo to insult them. You say 

 that I am unwilling to show both sides of the question ; permit me 

 to point out that I show neither side, but tho middle. — 11. A. 

 BuLLEV. Pardon me, I believe sufficient attention han been given 

 by science to tho infiuence of tho moon on the weather, with tho 

 result of showing thero is none. Saxby's Almanac I have tested 

 myself, with tho result of finding that whatever in it is now is not 

 in the least true, excc])! by accident ; what is true and trustworthy 

 in it can be found in Whilaker's Almanac. — J. S.\ndeii8. You 

 take Mr. Williams too much in earnest. Drunkenness is certainly 

 an evil, and every man should do his best in his own circle to 

 diminish it as far as possible. It would be us reasonable to sow tho 

 seeds of jdague and pestilence as to wilfully encourage drunkenness j 

 and you may bo sure Mr. Williams meant nothing of that kind. 

 Ilis vein of humour is too subtle for many of our readers.— lONo- 

 liAMi'H. 1 do not know how Cetewnyo should spell his name, and, 

 " not to put too fine a point npon it," I do not care. It is bad enough 

 to fight tho "nigger" kings ; but to talk of them, about them, or 

 with them (I speak from experience, having been a fellow passen- 

 ger of ono of the charming lot), in a little too much. To seo our 

 nigger king como on Imard with a garland of leaves round his 

 Tif.cit, and attended by white men (some wero Americans, too), 

 made similarly ridiculous, while his gallant army of full 150 stood 

 in single line, or marchpd to tho strains of " Pinafore j " to hear his 

 attendants, ono at least among whom was a gentleman by birth and 

 stan'ling, address him as "Your Majesty," and even some of the 

 pnsHengera followed suit, and then to gaugo his intellect, and find it 

 as shallow as a negro barber's in a one street village, out West, was 

 enough, in my humble judgment, to sicken tho conventional dog. 

 Yet, after oil, it was but a small-scale copy of what happens some- 

 times outside of Zululand and tho Sandwich Islands. 



