Apparatus to Facilitate Preservation of Food. 31 



It is needless to dwell upon the obvious fact that the apparatus 

 described maybe used very satisfactorily for many other purposes. 

 The trays are excellent crystallization dishes, for example, and 

 serial recrystallizations may be effected in them very conveniently. 



Fig. 2. A diagram of a tray with the lid out of place, to show especially the 

 ledge upon which the lid rests when the tray is covered. The depression in the edge 

 of the tray at one end, where the lid may readily be lifted with a finger, is also indi- 

 cated sharply. This depression does not extend to the surface of the ledge. There- 

 fore, when the lid is in place, the tray is completely closed. 



The general structure of the apparatus permits its placement in 

 out of the way positions. The whole of it can readily be pro- 

 tected by an easily removable impervious covering. 



Fig. 3. A diagram showing the relationships of the parts of the tray, including 

 the lid, and giving the main dimensions. 



I am indebted to my assistants, Mr. Walter H. Eddy and Dr. 

 Archibald E. Olpp, for the photograph and drawings of the 

 apparatus. Mr. Christian Seifert, of this laboratory, executed 

 admirably the plans for the frame. The glass trays were made to 

 order by the Whitall Tatum Co. 



