2g4 JUNCTURE FOR METALLIC p-(PLS. 



condensed than those of tl.e artificial phosphate, its decom- 

 position could not be expect<;d to proceed bo far. From 

 C*2() gram, of chrysolite, powdered and mixed with twice 

 its weight uf powdered charcoal, I obtained, by the same 

 process as above, \-'22 gram, of carbonate of lime, and 4'95 

 of phospliate of lime. 

 Beech char- 1 should mention, tliat 20 gram, of beech charcoal pow- 



^'^^^- der, treated with muriatic acid, yielded oidy 5 thousandths 



of a gramme of phosphate of lime, and 6 thousandths of a 

 gramme of carbonate. 

 All orgn.nized From these incjuiries it appears, that there is no animal 

 sub.^tances Will ^^, P^'''"*' ^^^ may jneld phosphorus, or at least phosphu- 

 rus, retted hidrogen gas, by simple distillation with a very vehe- 



ment fire ; for we know none of those substances, that do 

 not furnish phosphate of lime and charcoal. 

 Degree of h?at It follows too, that the quantity of the phosphates ob- 

 impoitaiit. tained by incineration may vary, according to the degree of 

 heat employed in the operation. 



yii. 



A simple and secnre Method of joining long or bent Metallic 

 Pipes, for Chemical Purposea ; with some Queries. In- a 

 JLefter from a Correspondent. 



To Mr. NICHOLSON. 

 SIR, 



Dr. Henrv's JlT is but lately, that I have made chemistry a- part of my 

 juncjure for studies, and it is therefore with considerable diffidence, that 

 meta ic pipe> ^ ^^^^ ^^^^ liberty of addressing you. In reading Dr. Hen- 

 ry's account of a portable copper boiler, for exhibiting the 

 most important farts respecting latent caloric*, I could 

 not help thinking, that a more simple, and at the same time 

 more secure, method of joining together long or bent me- 

 tallic pipes, might be; adopted, than by means of the sta§- 

 D\TereTU one fing box described in the passage alluded to. The pluH 

 proposed. vvhieh I propose to adopt >. o.y.ixts merely in having a small 



* See Epitome, p 4^7, 5th edition, 



tub6 



