Eobertson. — Distillation of Fatty Acids. 569 



The values thus obtained are given in Table I., and are 

 plotted against the time in figs. 1, 2, and 3. 



Table I. 



Time. 

 9 a.m. 

 9.45 a.m. 

 10.30 a.m. 



11 a.m. 

 11.30 a.m. 



12 noon 

 12.30 p.m. 



1 p.m. 

 1.30 p.m. 



2 p.m. 

 2.15 p.m. 

 2.30 p.m. 

 2.45 p.m. 



2.5 p.m. 

 2.15 p.m. 

 2.25 p.m. 

 2.35 p.m. 

 2.42 p.m. 



2.25 p.m. ... 



2.32 p.m. ... 



2.40 p.m. ... 



2.50 p.m. ... 



2.57 p.m. ... 



2.63 p.m. ... 



In series 1 are the complete results for the products from 

 three coils during the whole distillation. In series 2 and 3 

 only the last portions were examined, but in much greater 

 detail. 



It can hardly be expected to obtain similar results in three 

 instances, as the composition of the original charge, the tem- 

 perature of the distillation, and the rate are all liable to vary. 

 Each distillation, however, was performed with a medium 

 charge — that is, one obtained from about equal amounts of 

 hard and soft tallow. But in series 1 the temperature must 

 have been higher, and the distillation conducted more rapidly 

 towards the end, as the final portions contain a large portion 

 of the products of decomposition. The second distillation 



