1813.] emitted from the Lungs during Respiration. 333 



accurately than it can be done at present. 1 have collected all 

 the evidence on this subject at present in my power ; the results 

 are certainly very discordant, and no doubt in some instances are 

 to be attributed to errors. Most of the experiments were pro- 

 bably made, also, when the quantity was at its maximum ; and 

 this may account in part for the largeness of their results. This 

 was undoubtedly the case with those of Messrs. Allan and Pepys, 

 who inform us that all theirs were made " between breakfast and 

 dinner." 



Cub. Incb. 



M. Jurine,* of Geneva, " imagined" that for 

 every 100 cubic inches of atmospheric air re- 

 spired there were given off, of carbonic acid. 10 



Goodwin f estimated the quantity at 10 or 11 



Menzies,J from experiments made with con- 

 siderable accuracy, at 5 or 5*1 



Lavoisier and Seguin appear to have made it 

 much less, especially in their later experi- 

 ments. From the data in my possession I 

 am unable to ascertain the precise proportion. 



Mr. Murray § found it vary from 6*2 to 6'5 



Sir H. Davy || from 3-95 to 4*5 



Messrs. Allan and Pepys** from 3*50 to 9 50 

 per cent., according as the first or last pro- 

 ducts of an expiration were tried. They 



estimated the mean at about 8 



Myself, from 4 - 10 maximum to 3 - 30 mini- 

 mum. Mean of the 24 hours about 3*45 



A friend, from some partial experiments made 

 in my presence, appears to emit, upon an 

 average during the 24 hours, about 4-6 



Of these my own is by far the least, so much so, that I should 

 still almost suspect the accuracy of my experiments, had I not 

 found the quantity emitted by my friend, under precisely the 

 same circumstances, so much larger than by myself. Now we 

 are both nearly of the same age, that is, about 30 : of the two, 

 he is rather my junior. With respect to habits, &c. I believe 

 we are both equally regular, and enjoy equally good health. 

 How, then, is this idiosyncrasy to be accounted for ? 



• Ann. de Chim. torn. v. 261, &c. Bostock on Respiration, p. 85. 



+ Connection of Life with Respiration, p. 51. 



\ Mcnzies on Respiration, p. 50. Johnson's Animal Chemistry, vol. iii. 

 p. 127. 



(, Svfctem of Chemistry, vol. v. p. 493. Ed. 3. 



|| Researches, p. 431, &c. Bostock on Respiration, p. 84. Johnson's 

 Aninial Chemistry, vol. iii. p. 177. 



•« Tail. Trans. 1808, Part II. Phil. Mag. vol. xxxii. p. 242, &c 



