J34 0N RESPIRATION. 



air ovpr mer- air were passed up (the air of the laboratory being previously 

 cury 50'. examined and ascertained by the average of several trials at 



a medium temperature and pressure to be composed of 20 

 parts oxigen and 80 parts nitrogen). A mouse was put 

 through the mercury into the jar, and suffered to remain 50 

 minutes. When withdrawn the air was fouud to have dimi- 

 nished 1*25 c. in. On exposure to lime water, a farther' ab- 

 sorption was observed of 100 c. in. The remaining 15'25 

 c. in. being exposed to liquid sulphuret of potash, 00*46 

 e. in. were absorbed, leaving a residue of 14*79 o. in., which 

 was nitrogen. 

 Liquid suJ- It is evident the accuracy of this experiment may be cali- 



phate o no e j ^ n q Uest j on . f orj according to the analysis of the air of 

 •with nitrous the laboratory, the whole diminution should have been 3*50 

 gas a batter c _ j n> ^ ^ ^ was on ] v O'fl c. in., making a difference of 

 test of rxigen ' . , • , T • / i 



than sulphur- 00*79 Q. in., which 1 attribute to the attempt at operating 

 etted alkali, y,'^ the whole quantity of gas, instead of taking an aliquot 

 part of it, which 1 have since done, and always found to be 

 more easy and true. Neither do I think the sulphuretted 

 alkalis so good and rapid tests of oxigen gas as the liquid 

 sulphate of iron impregnated with nitrous gas. 



30 January, I8O9. Temp. 44°, P. 28*94. 



Mouse killed Exp. 2. Into an inverted Jar in the same manner as the 



in oxigen gas. above were passed up 13 cubic inches of oxigen gas nearly 



pure. A mouse was then conveyed through the mercury 



into the jar, where it was suffered to remain an hour and a 



quarter, when it was quite dead, and the gas had in that 



time diminished 100 cubic inch. An accident prevented 



the farther prosecution of this experiment. 



Exp. 3. At the same time another mouse was placed in 

 Another. ... *> *•,*>■ , , , T n , 



a like quantity ot oxigen nearly two hours. When taken out 



it was quite dead. The gas had diminished as before 1*00 



cubic inch, and being then examined by lime water, 89*50 



per cent disappeared, showing, that the animal had absorbed 



nearly the whole of the oxigen, and given out a considerable 



quantity of carbonic av;id gas. 



19 Feb. Temp. 63°, P. 30*10. 



„, • 1 •, Exp. 4. Two mice were suffered to die in one cubic inch 

 Two mice til- l 



•f 



