ARTIFICIAL INCUBATIOH. 



moist s nd i nder the egg-drawer, and by a few wet 



sf onge n'n the egg-drawer. 



These incubators do not require any watching. No 



one gets up in the night to look after them. The large 

 body of sawdust absorbs heat, and gives it up to the 

 egg-drawer as it begins to cool; hence, the heat varies 

 very slowly. If a lamp is preferred, it may be attached 

 by having two tubes, one above the other, extending to 

 a small "boiler" outside, which is heated by a lamp > 

 capable of accurate regulation, in the usual way. 



HOW TO MAKE AN INCUBATOR. 



To make this incubator, get your tinner to make you 

 a tank fifteen inches wide, thirty inches long, and 

 twelve inches deep, of galvanized iron or zinc, the iron 

 being preferable. On the top should be a tube one inch 

 in diameter and eight inches high. In front should be 

 another tube, nine inches long, to which should be at- 

 tached a spigot. 



Having made your tank, have what :s called the ven- 

 tilator made, which is a wooden box with a bottom, but 

 no top. The ventilator should be eight inches deep, and 

 one inch smaller all around than the tank, as the tank 

 must rest on inch boards, placed upright to support it, 

 or on iron rods. In the ventilator should be two or 

 three tin tubes, one half inch in diameter and six inches 

 long. They sltould extend through the bottom, so as to 

 ndmit air from below, and to within two inches of the 

 top, or a little less. * 



Now make an egg-drawer, which is a frame of wood, 

 three inches deep, having no top or bottom, except at 

 the front, where it is boxed off and filled with sawdust, 

 which is covered over afterward with a piece of muslin^, 



