PLANT PHYSIOLOGY. 



or they may be set at right angles, when they will shade the 

 house completely, and all intermediate degrees may be 

 obtained. Of course the intermediate degrees are given by 

 bars of full light and shade, but the experience of gardeners 

 shows that this slat-shading is perfectly efficient.* 



Passing next to the Laboratory we find its construction 

 much simpler. It will be built of brick, some 28 by 18 feet 

 inside measure (Fig. 5), and at least 9 feet to the ceiling. 

 Tables for twelve students are needed, especially for micro- 

 scopic and other fine work, and these may well be of the usual 



Fir,. 6. CROSS-SECTION THROUGH PHYSIOLOGICAL LABORATORY. 

 (Compare with Fig. 5.) Scale as in Fig. 2. 



laboratory form and size, i.e., as shown in section in Fig. 6, 

 some 6 feet long (for four students), 3 feet wide, and 2 feet 

 6 inches high, with a vertical row of drawers on the middle of 

 each side. Tables for the assembling of apparatus are needed, 

 Avhich, as they are used standing, may best be 3 feet high; and 

 they may have lockers beneath for storage (Fig. 6). Very 



* There are references to descriptions of experiment houses in Detmer, page S, 

 foot-note i, but these I have not myself read. 



