GREENHOUSE AND LABORATORY 



35 



a way that steam, gas-fumes, vapor of chemicals, etc., often 

 developed in laboratory work in physiology, can escape. Ac- 



<^ 



/-" 



Figs. 3 (upper) and 4 (lower). — Cross-sections through experiment green- 

 house, AT DARK AND GAS ROOMS AND AT CENTRAL TABLES; X^j. 

 The*' various features are explained by Fig. 2 and the text. 



cordingly, I have designed, and later hope to add, the special 

 room shown in figures 2 and 3. It is to be built inside the green- 

 house, answering in general form and size to the dark room, 



