130 Report of the Department of Bacteriology of the 



From Figs. 2 and 4 it can be seen that the front of the refrigerator 

 consists wholly of doors and door-jambs. The outer layer of the 

 doors is of oak, glued up with a panel effect on the outside, but 

 smooth and flush on the inner surface. The edges of the doors 

 and the jambs are beveled on all sides in order to secure a close fit. 

 The central portion, making up about two-thirds of the entire door, 



Fig. 3. — Vertical Section of Refrigerator and Incubator. 



(Diagonal hatching indicates cork-board; other hatching, wood.) 



is a layer of four-inch cork-board, the inner surface of which is 

 projected by a sheet of zinc nailed securely to the whitewood edges. 

 The upper door is for admitting ice. The inner edge of the thresh- 

 old is covered with a strip of galvanized iron and is slightly lower 

 than the top of the ice-rack. Thanks to this device a large cake 

 of ice, raised by rope and pulley, can be swung into place without 



