BOUILLON. 75 



of 1 litre, just 100 times as much, minus that for the 

 two samples used in titration, will be needed. For 

 example : To neutralize 10 c.c. of bouillon, 2 c.c. of the 

 diluted (0.4 per cent.) caustic soda solution were em- 

 ployed. For the remaining 980 c.c. of the litre of 

 bouillon, then, 196 c.c. (200 c.c. — 4 c.c, the amount 

 employed for the two samples of 10 c.c. each of bouil- 

 lon) is needed of the 0.4 per cent, solution, or one- 

 tenth of this amount of the 4 per cent, solution. 



For the neutralization of the whole bulk of the 

 bouillon it is better to employ the strong alkaline 

 solution, as by its use the volume is not increased 

 to so great an extent as when the dilute solution is 

 used. 



It is evident that this method is much more exact 

 than that ordinarily employed, but at the same time it 

 must be remembered that for its success it requires 

 exactness in the measurement of the volumes and the 

 preparation of the dilutions. To obviate error, it is 

 better to employ this method when the solutions are all 

 cool and of nearly the same temperature, so that rapid 

 rfluctuations in temperature, and consequent alterations 

 in volume, w'ill not materially interfere with the accu- 

 racy of the results. 



This method of neutralization, which is employed by 

 Schultz, is to be recommended for those experiments in 

 which slight inaccuracies in the reaction of the media 

 play an important part. 



For the ordinary purpose^ of the beginner, however, 

 results quite satisfactory in their nature may be obtained 

 by the employment of the saturated soda solution for 

 neutralization and the litmus paper as the indicator. 

 For some time, however, it has been our practice to 



