Incubation. — Part I 



1381 



may be allowed to drop part-way open and there be securely fastened by 

 a small chain or strong cord. In this way the air passes over them and 



Fig. 25. — A good incubator cellar 



into the room, an arrangement that does not permit direct draughts 

 to reach the incubators. It is also advisable to place muslin curtains 

 over the windows that are left open permanently, the other windows 

 affording most of the light. The latter may be shaded in case the sun 

 shines through on the incubators or affects the temperature of the room. 

 Fig. 25 represents the writer's idea of a very good incubator cellar.* 



THE OIL SUPPLY 



A considerable amount of labor may be saved by piping the oil to the 

 incubator room. This is often done by placing an oil tank under ground 

 a few feet from the cellar wall, 

 the oil being conveyed from 

 the tank to the cellar by 

 means of a small pipe. This 

 pipe is connected with one or 

 more faucets. A very simple 

 and inexpensive arrangement 

 is shown in Figs. 26 and 27. 

 The framework on which the 

 oil barrel rests is made of 

 planks about twelve inches 



wide. The upper edges of vio. 26.-The oil barrdin position 



these planks are cut so as to 



conform to the shape of the barrel. The barrel should be placed in the 

 shade to prevent evaporation of the oil. The north side of the build- 



* This picture was taken from Mr. Joseph Tolman's incubator cellar at Rockland, Mass. 



