166 



SCIENTIFIC INTELLIGENCE. 



[X8S3. 



naplUha, so as to fit it for preser\iug potassium : — Talce a cousiderablc 

 quantity of the best rectified coal-uaplilha, and about teu per ceut. of 

 couceiitrated sulphuric acid. Keep tl-.eni iu coutact, with frequent 

 agitation, tor three or four days. Decant tlio uaphtlia, and ad'l tVosh 

 acid, repeating tlie same process several times. The naphtha, -n-hich 

 is now of a deep colour, \vith au acid reaction, and most pungent odour, 

 is distilled very gradually, and neutralized by a current of dry 

 ammoniacal gas passed through it. It is then repeatedly distilled, 

 rcjectiug the last portions. Thus, it fiuaUy appears as an c.x'ceedingly 

 mobile limpid fluid, of a pleasant odour, and is pertectly adapted for 

 preserving potassium. To obtain naphthaline, mix common bituminous 

 coal in fine powder with an equal quantity of qtiick-lime, put the 

 mixture in a small tin-plate stilly aud heat over the gas furnace for 

 about an hour. On afterwards opening the still, naphthaline will be 

 found deposited inside the head. — Arlizan. 



Canadian Shijiping. — In the annual circular issned by Messrs. Tonge 

 & Co., of Liverpool, on the Shipjjing Trade of 1852, we . are glad to 

 notice the subjoined testimony of the progress made by ^thc Quebec 

 Shipbuilders in their highly important brauce of Art and Industry : — 

 " We have much pleasure in noticing a marked improvement, both in 

 the model, material and finish of Canadian Ships, the majority of 

 which have been constructed to class si.x or seven years, and to which 

 a decided preference is given by buyers over the spruce ships, or those 

 classing but four or five years, even at a very increased price. Among 

 those which liave an-ived within the last eight months, will be found 

 some, as fine models of naval architecture, as ever have been produced, 

 combining in reality, (from having great length of floor and tine ends) 

 both carrying and sailing properties, of no ordinary kind. 



monthly Meteorological Kegister, at Her Majesty's Magnetical Observatory, Toronto, Canada West.— January, 1853. 



LatilHfle .13 dr;i. .39.-1 min. A'oti/i. Lmiciitmh, 79 dnj. 21 min. Wed. JSlcvnUon above Lake Ontario : 108 feet. 



Sutn of the Atmospheric Current, :.n mites, resolved into the four Cardinal 

 directions. 



Norlli. Wesl. South. East. 



2472.69 1911.13 800.84 1064.17 



Mean velocilv of the wind - - 6 34 miles f»er hour. 

 Maxiuinni ve'locjly - - - - - 25 3 nil's per li'r, liom 11 a.m. to noon 25lh. 



Most windy day 24lh : Mean velociiy, 13..53 miles per hour. 



Least windy day - - - - - lOlh : Mean velocilv, 1.40. ditto. 



Mon windy hour noun: Mean velociiy, 8,37 ditto. 



Least windy hour - - - - -9 , p.m. Mean velocity, 5.20 daio. 

 Mean diurnal variation - - - 3.17 miles. 



The column heiuled " M.ijncl" is .'in aiirmpt in rlisiiin'iii-h the character 

 of each diiy, as rcgard.s the lii'iiiinhv ..r ..Mi. in d 'lif linn nalions of the 

 Magnetic dee! illation, indicntcd hv i in -.11 m-i~Ui m- iti.l nnm. iils [il Toioiilo. 

 The chlssilicalioii is, lo some .•.xn-iil, MilniiMiy, iiiid iiuiy icrpnre liilnre 

 modilicalion, but has been found tolerably dehniie as tar as oppUcd. It is as 

 follows :— 



(a) A marked absence orMajuelical dislurbnncc. 



(A) Uniinporlfint movemenls, not to be called disturbance. 



(r) Marked disturbance — wnelher shewn by frequency or amount of 

 deviation from the normal curve — but of no great iiiiporiance. 



(//) A grealer degree of dislurbance — but nut of lonj; continuance. 



(r) Considerable dist in bailee — lasting more or less the whole day. 



(/) A Magnelical disturbance of the first class. 



The day is reckoned from noon to noon. II i wo letters nre placed, the first 

 Bpplics ;o' llie earlier, the laiier lo the later part of the trnce. Although the 

 Ducluuiiiiiii IS parliiiilaily ivli'rred lo, il rarely hnp]iens that the same terms 

 are nut ap|ilicable lo the chnnges of the Horizontal Force also. 

 Hishcsl I?Mroineler - - 30.315, at 10 P. M., on 27lh 1 Monthly range: 

 Lowest JJaromcter - - 2S.6.53, al 4 A.M., on 21lh J 1.662 inches. 



Highest observed Temp. - 40 9, al 2 P. M., on 9ih ) Monthly rang 



Lowest resisi'd Temp. 9.7, at A.M., oa 19lh < 50.6 



Mean Highejt observed Temperature - - 29.04 ) Mean daily r 



Mean Regisiered Minimum 14.89 S 14.16 



Greatest daily range 40.9 from 2 P.M.,onl5ih toA.M 



Wannest day - - 11th - - - Mean Temperature - 32 55 j Di 

 Coldest day - - - 26th - - - Mean Temperature - 3.72$ 



The " Means" are derived from six observations daily, viz., al 

 A. M., and 2, 4, 10 and 12, P. M 



., of 16th. 

 lierenee : 

 28 83 

 6 and 8, 



