1832 



Journal of Applied Microscopy 



ture beds. For the reception of water cultures, and potted plants under experi- 

 ment, seen in use in this way in Fig. 4, the heavy glass tops may be used. By 

 removing the glass tops the tables are then in the form of shallow tanks, to 

 receive a bed of sand, or soil, as the case may require, to the depth or some 15 

 or 20 cm. Being constructed of concrete, the whole is thoroughly solid, and 

 does not warp or sour. A smaller table, of similar construction, is found at 

 either end of the room. In Fig. 3, this table is occupied by salt water aquaria, 

 in some of which at the time of our visit a fine growth of a Bryopsis was being 

 cultivated for experimental purposes. On the corresponding table at the other 

 end of the room, one may see, in Fig. 4, three double walled bottles for experi- 

 ment with different colored lights. It will be noticed that they are not uniform 



Fu 



in size or shape, although made at the same time and place, from which circum- 

 stance it may be inferred that they are blown and not moulded. These three 

 bottles are of unusual historic interest to botanists, since they are those used by 

 Sachs in his first work on the effects upon growth of the different parts of the 

 spectrum. They are still sound, and in every day use ! 



In two corners stand iron tanks, each of about a cubic meter capacity, for 

 holding a supply of rain and of distilled water (Fig. 4), In a third corner there 

 is built in a moist chamber (Fig, 3), constructed of iron, for the framing, and 

 glass. The walls are lined with a rubblework, made by setting small pieces of 

 pumice into cement. The result is a rough surface holding the water, which is 

 supplied from a perforated pipe running around the top of the chamber. If nec- 

 essary, the flow of water over the walls may be made continual. The floor is of 



