<5 THE PLANT WORLD. 



smaller, building consisting of two rooms. One of these, used 

 as a tool shop, is supplied with a complete forge and necessary 

 tools for making the more simple apparatus to be used in various 

 experiments. The other is called a " model room " and here the 

 director and assistant are endeavoring to put up a small model 

 of a plantation rubber factory. 



In the chemical and plant physiological laboratories there are 

 narrow, crudely made tables, running the entire length of the 

 room and attached to the wall. These are covered with asbestos, 

 zinc or glass. Above, and under the tables are rows upon rows 

 of shelves, which in the chemical laboratory on one side of the 

 room are devoted to reagents, and on the opposite side to glass- 

 ware. At one end of the laboratory a large hood of glass and 

 zinc is fitted into the corner. Here all work with poisonous gases 

 is done. Under a large window at the other end of the room all 

 apparatus for bacteriological work can be found — incubator, steri- 

 lizers, glassware, reagents, also a good microscope, with oil im- 

 mersion lens and camera lucida, a microtome, and several dis- 

 secting microscopes. On specially adapted tables are placed a 

 Ralston still and the necessary chemical'balances. In this room 

 as in both the plant physiological laboratory and dark room, is 

 a porcelain-lined sink with running water, piped in from a tank 

 just outside the laboratory building. For heating purposes a 

 gasoline stove is used, and for the smaller work a Primus oil 

 stove. 



In the plant physiological room is a klinostat, auxanometer and 

 all of the more common apparatus used in experiments of a 

 phytophysiological nature. At present over a dozen experiments 

 are going on here, principally on the physiology of Castilloa, 

 including the influence of light, transpiration, wounding of trunk, 

 effect of gravity on growth, and recording of the rate of growth 

 under different conditions. 



Opening from this room is a smaller one, originally planned 

 for a back veranda, but now screened in and used for the potted 

 rubber plants to be experimented on later in the plant physiological 

 room. 



Photographic records are taken of all experiments, both in the 



