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THE POPULAR SCIENCE MONTHLY 



plot having trees for the cats to climb in, basins in which swimming 

 birds may disport themselves and soil surrounded with cement walls 

 within which the wild rabbits may burrow. The kangaroos here find 

 ample space in which to run about while snakes and lizards sun them- 

 selves on the rock-piles and turtles and frogs alternate between land 

 and water. 



The two glass houses (Fig. 5), one adapted for warmth and the 

 other for cold, are in the south portion of the grounds. The glazed 

 superstructure rests upon a thick wall and the floor lies one half a 

 meter below the ground level. Each glass house is divided into a cul- 



Fig. 7. Middle Corridor of the Main Building with Cultures of Alg.e. 



ture room and a preparation room (Fig. 6), the latter being connected 

 with the main building by a glass-covered passage-way. Each culture 

 ioom is provided with a water and sand bed and a water reservoir 

 sunken in the floor. Electric light enables the experimenter to work 

 continuously when necessary. Venetian curtains are used as a protec- 

 tion from excess of light or cold. 



The middle corridor of the main building is covered with a double 

 glass roof. One portion, used as a warm room, contains sweating boxes 

 maintained at various temperatures. In the cold portion (Fig. 7) the 

 conditions are favorable for the culture of fresh water and marine 

 algae and the various organisms that grow in slime. The garden in- 

 cludes beds for the cultivation of plants for fodder and the experimental 

 work. One large basin (Fig. 8), and four that are smaller, contain the 



