449 



New Patents lately enrolled. 



[Dec. 1, 



oxide magnetic Ii very fmaU, fmce a fingle 

 grain of c.imphor, diflbived in an ade 

 quate poiMon of alkuhol, and mixed with 

 100 grains of the oxide in a glals moriar, 

 will, by a red-heat, render the whole mag- 

 netic. 



As oxides of iron are rendered magne- 

 tic by heat when mixed with infl ^mmsble 

 matter, it may be underftood why Pruf- 

 lian-blue, fulphurets, and ores of iron 

 containing inflamiTiable matter, become 

 magnetic by the agency of fire ; while 

 thefe fame ones revert to their unmagnetic 

 ftate, when the heat hns been continued 

 long enough to drive off the whole of the 

 inflammable matttr. Thus calcined ful- 

 phuiets of iron, diftingiitfhxble by their 

 red colour, are found among the cinders 

 of a common fire, unmagnetic, when ail 

 the fulphnr is fublimed. 



Mr. Knight, in a paper " On the 

 ReprodufVionof Buds," fays, every tree, 

 in the ordinary courfe of its growth, ge- 

 nerates in eich feafon thofe buds which 

 expand in the fucceeding fprinp;, and the 

 buds thus gtneraed contain in many in- 

 flinces the whole leaves which appear in 

 the following fummer. But it ihefe buds 

 be deltroyrd in the winter, or early part 

 of the fpring, other buds, in many fpecies 

 of tress, nie p,e:.eiated, wliich in every 

 refpeff perform the office of thofe which 

 previoudy exilled, except that they never 

 afford fruit or blofToms. He then proceeds 

 to mention different theories to account 

 for this ; and as his own opinion, he (ays, 



that the buds neither fpring from the me« 

 dul'a nor the bark, but are generated by 

 central vtfTels which fpring from tne Uie* 

 ral orifices of the alUumous tubes. The 

 piafticability of propagsting fome plants 

 from their leaves may feem to fta'>d in op- 

 pofition to this h\ pothefis ; but the cen- 

 tral veflfel is aiway* a component part of 

 the ie^f, and from it 'he bud ani vf'ung 

 plant probably originate Mr K- thinks 

 that ft* feeds contain lef^ 'han three buds, 

 one of which onlv, except m rales of ac- 

 cdent, gei iTiinates. Some feeds contain a 

 much greater number. The feed of the 

 peach appears to be provided *ith ten or 

 twelve leaves, each of wh ch [)robably co- 

 vers the rudiment of a bud, and the feeds, 

 like the buds of the horie-chefnut, cnntair* 

 all the leaves, and apparently all the buds, 

 of the fucceeding year. 



Annual and biennial plants do not ap- 

 pear to polTefs the po-vgr given to peren- 

 nial phints to reproduce their buds. Some 

 biennials pofTefs a fingular r Jburce when 

 all iheir buds have been deftroyed. *' A 

 turnip (lays Mr. K.) from which I had 

 cut -flF the greater part of the fruii-lialks, 

 and of which all the buds had been de- 

 ftroyed, remained fome weeks in an ap- 

 paientiy dormant ftate ; after which the 

 fird feed in each pod germinated, and 

 burfting the feed-velTcl, itiemed to execute 

 the office of a bud and leaves to tlie parent 

 plant during the fnoit lemaining term of 

 itsexillence, when its preternatural foliage 

 ptriftied with it." 



NEW PATENTS LATELY ENROLLED. 



MR. WILLIAM Kent's (Plymouth), 

 for Additions and Improvements en a 

 Candhjlick, as ivill he found to pre'vent 

 accidental firts in the Ufe if Candles. 



THIS inventicn, if iuch it may be call- 

 ed, is a very trifling improvement 

 tij)oo thofe guard-candlellicks which have 

 been many years msde ufe of in bed-rooms 

 by thofe who are accultomed to burn 

 niiht-ligli'S. Iiilter.d of the tiu guard, 

 gl'fs 01 horn is recomincnded ; a contriv- 

 aice isaddid to keep in the water when 

 the caniUcl'tick is to he m. ved about ; and 

 a hole in the locket to admit the water, 

 and to take out the ei.d of the candle that 

 drops jr.. 



MR. ROWNTRF.E's (CHRIST-CHURCH, 



SURREY), yiraw Improvement in Wa - 



ter-Clofets. 



The water-clofet defcribed in this fpe- 

 cification is portable, and may be moved 

 from place to place without taking to 

 pieces, and has ail the advantages in re- 

 f|)cit to prevention ot Imell wiiicii is found 

 in thf fe chat are fixed. It may be maxle 

 for (ick-rcoms, and on fuch a fcale as to 

 occu|)y 110 moie ipace, or be more incum- 

 braiice, thm a ni^lit chair. Thi- refer- 

 vo:r for water is fixed in the fame piece of 

 furniture as the bafin and foil-receiver, 

 which latter is fo fixed to the foil pipe 

 from the bafin, that it may be taken away 



and 



