1835.J on Urine, 16 



which passing through the lime water, rendered it milky. 

 Thus shewing the evolution of carbonic acid gas from the 

 urine. 



I repeated this experiment of Vogel several times, em- 

 ploying healthy urine recently voided and still warm. The 

 urine frothed a good deal and emitted air bubbles, but the 

 lime water remained perfectly transparent during the whole 

 process, shewing that no carbonic acid gas was emitted. 



When fresh urine is mixed with lime water, an imme- 

 diate precipitate of white flocks may be observed. When 

 these are collected, washed and dried without exposure to 

 the atmosphere, so as to prevent any excess of lime water 

 that may be present, from being thrown down by carbonic 

 acid, they will be found to consist of pure phosphate of 

 lime, for they dissolve in dilute nitric acid without any 

 effervescence, and the solution is again precipitated in 

 flocks by ammonia. 



It is obvious from these facts which I have often verified, 

 that recent healthy urine in general contains no sensible 

 quantity of carbonic acid or alkaline carbonate. But from 

 the experiments of Dr. Marcet, it is obvious that in a cer- 

 tain state of the body, the urine contains carbonic acid at 

 the instant that it is emitted. For he found upon some 

 occasions, that urine when warm, when under the ex- 

 hausted receiver of an air pump, gave out a gas which 

 rendered lime water turbid, while at other times the gas 

 evolved, did not in the least alter the transparency of lime 

 water. This has been the case in all my trials, but Vogel 

 and Marcet found it different in their experiments. We 

 may conclude then that carbonic acid is an occasional but 

 not a constant constituent of urine. 



Article III. 



Examination af Lymph, Blood and Chyle. By John Mullbr, 



M.D. Professor of Physiology in the University of Bonn. 



(continued f 7' om vol. i. p. 433. J 



Prevost and Dumas have found more globules in arterial 

 than in veinous blood, and also more red coagulum, and 

 Mayer has confirmed their results. Muller obtained from 

 1392 grs. of blood from the jugular vein of a goat 5 J grs. 



