﻿INSTITUTE OF PHYSIOLOGY
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special rooms including a room for preparing food (No. 84) with staircase leading to the cellar and to the garret where hay, straw, and dried food for the animals are stored. The rooms for rabbits and guinea-pigs also have cages outside that are in communication with a trap-door, which is closed during winter.
The sheds are heated by radiators receiving the vapor by a subterranean conducting tube connected with the general heating plant.
At the end of the yard are two places, (No. 79 and 80) offering accommodation for large animals such as horses, cows, and calves. In the garden there is a frog pond, comprising three basins, molded in reinforced concrete. These basins, normally supplied by rain water from the roofs of the buildings, are surrounded by a large border with grass and plants. The basins have an overflow for emptying in the sewer and for maintaining the water at a constant level. The cleaning of the basins is facilitated by an opening in the floor. The largest basin has a central part which is 2 meters deep and two lateral wings with floors built on an incline so that the frogs can easily leave the water. The central part serves in winter for the retreat of the frogs. Treads lead from the floor of the wings
to the bottom of the central part. The pond with borders and plants is railed in and covered by a net of metal wire for protection against cats. The openings of the railing are so small that insects can enter the pond freely but frogs of normal size cannot leave it.
In the basement of the building there is also a large basin employed as winter quarters for the frogs, which must be at a room temperature or which must be employed regularly for the experiments of students.
The laboratory has been so conceived and equipped that it can be used for all kinds of physiological research work and for experiments illustrating the principles of physiology for teaching purposes, but it can easily be understood that not all branches of physiology have reached the same degree of development. In general we were studious in applying physical methods of measuring the different physiological phenomena to facilitate comparison. It is also an accepted rule that progress in physiology advances by help of a meter and a weight.
A great many of our instruments have a general character, so that we can get up impromptu experiments. We have avoided as far as possible spending
Fig. 14.—Animal Sheds