When considerable numbers are present, they can be detected and often identified in cover-glass smears.
Pour on the film as much of the stain as the cover-glass will hold.
Pour on the film as much of the mordant as the cover-glass will hold.
Place a drop of water containing Paramœcia on a slide with cover-glass over it.
To preserve these specimens they must be surrounded with some kind of cover-glass cement.
Run a thin mixture of cherry gum in water under the cover-glass.
For a further study of the blood kill a toad or frog and place a drop of the blood on a slide with a cover-glass over it.
Dip the cover-glass into a beaker containing hot water in order to remove some of the vaseline adhering to it.
In either case the cell must be quite full of water before the cover-glass is applied, so that no air-bubbles are included.
It can be distinguished by running a little iodin solution under the cover-glass (see p. 37).