and Laboratory Methods. 



17'26 



The photographic room gets ventilation through the same flue that ventilates 

 the hood, and is lighted by an outside window which can be shut off, and by a 

 lamp in the hood, the light coming through a window in the partition. 



Water connections have been made in the room behind this photographic 

 room, so that it can be, if desired, fitted later with aquaria. 



Fig. 10. — Elementary Laboratory. 



Coat and toilet rooms are on this floor. 



A small dark room at the front of the basement is to be used for experiments 

 in plant physiology. It is to be provided with apparatus for maintaining con- 

 stant temperatures. A good deal of this work is, however, carried on in the con- 

 servatory, where tables have been arranged for that purpose. 

 Vassar College. AarON L. Treadwell. 



A Test to Distinguish Methylen Blue from Methyl Blue. — If am- 

 monia water is added to a dilute solution of methyl blue, the solution is decolor- 

 ized ; whereas, a very highly diluted solution of methylen blue is not decolorized 

 by the ammonia water. There are also two distinct kinds of methylen blue 

 which should not be confused ; the methylen blue used for medicinal purposes 

 and the methylen blue used for staining purposes. — Merck's Archives. 



