Abstract
Sections were cut from fresh unfixed tissues by means of a microtome provided with an apparatus for the simultaneous cooling of the knife and freezing stage. These sections were of uniform thickness and were found to be very suitable for histochemical staining. Such sections were immersed while still frozen in the fluid which contained the necessary chemicals for a specific technic. After remaining in the fluid for an appropriate time, the sections were put on slides and dried in warm air. The remaining steps were carried out on the slides. Several histochemical procedures (phosphatase, esterase, glycogen) were found to give good results when this technic was used.
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