56 Proceedings of Royal Society of Edinburgh. [sess. 
looked on as due to increased viscosity of the solution, as will be 
shown further on. 
0 
li 
i I 
An amide is usually represented by the formula R - C - NH 2 
where R stands for some radical. The formula R - C - OH has 
II 
NH 
also been suggested, although recent work * favours the adoption 
of the former. In investigating the constitution of such sub- 
stances, it is generally agreed that physical methods give the most 
reliable results to draw conclusions from. Now, if R - C - OH 
1 1 
NH 
represented the formula of an amide, we should expect a substance 
of this kind to show at least feebly acid properties. I have 
* Berl. Berichte, 34 , 3142 , 3161 , 3558 . 
