6!^ On Vegelal'le and Animal Jnahjsis. 



from which it falls into the ferule, and from ibence to the 

 bottom of the piass tube. 



If this substantc, thtrefore, i^e a mixture of hyper-oxy- 

 S^naiecl n.riate of potash and of vegetable substance in pro- 

 |;,t:r proporlions, and if ihe K-wer part of the glass tube be 

 siilncienlly warm, it \\\\\ briskly take tire: the vegcrable 

 subatiince will then be instar taneonsly destroyed and irans- 

 formccl into water and carboiliC acid, which will be collected 

 over mertiry with the oxygen gas issuing by ilie small la- 

 teral tube. 



In order loexecn'e this operation easily, wt n)ay conceive 

 that it is necessary that the matter be dctachtd tntircly 

 from the cavity and fall to li;e bottom of the. tube. For 

 this puipose it is made up into su all balls, as will be iTien- 

 lioned presently : we may also conceive that it is neccs?.aiy 

 to inqr.ire what is the proper quantity of hvper-oxygeiiatcct 

 nuiriaie lor burning completely vegetable sub'^iance. We 

 nuist even take the precaution to employ at hast one half 

 more than this substance requires, in ordtr that the com- 

 bustion may be eon)plete. 



But of all the inquiries which ought to precede the opera- 

 tion, the ni(st important is the analysis of the hyper- oxy- 

 genated muriate employed ; for upon this all the calculations 

 of the exptriineuis aie in a great measure founded. 



All this beino' well understood, ii will be easv to analyse 

 a vcgctal'le substance with the hvpcr- oxygenated muriate. 

 The substance is to be ground on a porphvry' slab yvith the 

 greatest care, as also the hyper oxygenated muriate; quan- 

 tities of both are to be «eighed-in very accurate scales ; they 

 are to be well mixed, moistened, and rolled into cslinders; 

 these are to be divided into small balls, which are to be cx- 

 ^^ostd to a boiliiui heat in ord( r to render ihem as dry as 

 the original materials were. Jf the suVstance to be analysed 

 is a vegetable acid, it is to be combined with hme or barytas 

 before mixing it with the hyper-oxvcenaied muriate: the 

 salt which re.-uits is to be analysed, and an account is to be 

 taken of the eailjonic acid which remains muted to the 

 base alter the exiierimenl • lastly, if the substance to be 

 analysed contains some bodies which are foreign to its na- 

 ture, they are alsu to be taken account of. 



Thus we know aceurattly that a given weight of this 

 mixture represents a known weight of t'yper-oxyg;enate(l 

 muriate, mid of itic substance which we wisb. to analyse. 



Now in order to fimsh the operation, uoibing. more is 

 requisite than to make the bottom of the tube red hot; to 

 drive oflall the air by means of a certain number of balls, 



which 



