474 Mr. S. U. Pickering on Self-recorded Breaks 



satisfactorily the first break, B, although the existence of 

 some irregularity in this region is perfectly evident. The 

 lines in this figure are straight lines also, except the portion 



Fig. 2. 



C D, where a very slight curvature is noticeable. The break 

 accompanying the change in strength of the solution, C, is 

 just as well marked as the undoubted breaks due to the 

 starting and stopping of the stream of acid, A and D. 



The determinations may be modified in many ways. The 

 strength of the acid may be varied, or the liquid taken in the 

 calorimeter may be acid of various strengths, instead of water : 

 the rate at which the acid is added may be altered consider- 

 ably, and, instead of being uniform, it may be accelerated or 

 retarded during the addition, by connecting the bottle with 

 another one, into which, or out of which, water is run at a rate 

 greater than in the case of the acid. The form of the figure 

 obtained in any particular determination admits also of exten- 



