AMMONIA COEFFICIENT OF URINES. 159 



To render this table reasonably compact I have calculated it only for 

 entire cubic centimeters. In the most frequently occurring cases, where 

 fractions of a cubic centimeter of gas are involved, the ammonia coefii- 

 cient may be very easily interpolated, from the numbers given in this 

 table. 



I also present a table (II) calculated from that of Vanino ^ vrhereby 

 the actual quantity of urea in a urine may be ascertained from the num- 

 ber of cubic centimeters of gas evolved by the mercuric nitrate solution. 

 To obtain the amount of urea, the number of cubic centimeters of gas 

 obtained is multiplied by the number given in the table corresponding 

 to the temperature and pressure of the gas, thus : if 76.4 cubic centimeters' 

 of gas were found at 35° and 734 millimeters' barometric pressure, the 

 urea amounts to 76.4 X 1.181^0.091 gram urea. 



^Ztschr. f. anal. Chem. (1895), 34, 56. 



