62 TRANSACTIONS OF THE CANADIAN INSTITUTE. [Vo.t. VIII. 
Recently Raehlmann, in the Muenchener Medicinische Wochenschaft, 
has applied the method to the study of coloured solutions and to solutions 
of albumen. In the albumen solutions he was able to see very minute 
particles, which disappeared when the solution was heated to the coagu- 
lation point. In glycogen solutions, when sufficiently dilute, particles 
could also be seen as well as in glucose and milk sugar solutions ; peptone 
solutions showed an exceedingly faint diffraction cone, but individual 
particles could not be seen. 
With a glycogen solution of proper concentration this interesting 
experiment was performed. A drop of diastase was added to the fluid, 
and immediately the cone of light in the microscope disappeared, and in 
their place a larger and more scattered disc could be seen, which gave, ac- 
cording to Raehlmann, the same picture as that of dextrine or glucose. 
He thinks that in the glycogen what was seen was a special type of mole- 
cular complex, determined probably by the form of the simple molecule, 
and that by the addition of the diastase he was able to watch its passage 
into the isomeric sugar. 
