242 
animal, to put it into a strong, but cold dissolution 
of caustic potash, leaving it there, according to 
circumstances, from 10 to 48 hours. The interior 
torgans have, as a rule, to be dissolved to such a degree 
hat they partly or altogether can be washed out by 
putting the animal into water and treating it with a 
pincet or the like. All depends on watching the right 
moment, as the chitine of many forms get a peculiarly 
loose consistence, becomes decoloured, even shrinks at 
times et cet., if left too long in the strong dissolution. 
The examination under the microscope is generally 
performed in glycerine which, in this case, is preferable 
to water; of colouring | have made no use at all 
Copenhagen, the beginning of March 1893. 
