DOMESTIC INCUBATOR. 277 



Upon the small scale, and for the purpose of 

 domestic experiment and instruction, we may be 

 permitted to describe a little apparatus which we 

 have frequently employed with success, and which 

 can be made at any of the tinmen's shops. It consists 

 of a double-case cylindrical tin vessel supported on 

 three legs of tin. The hollow interior space is for 

 the eggs ; the bottom and sides should be double, 

 filled with warm water, which is kept at a certain 

 temperature, 100 to 105, by a small spirit-lamp. 

 At the top of one of the sides is a small hole, 

 through which a thermometer is introduced into 

 the water. The chamber for the eggs also requires 

 a thermometer, which is introduced through a tube 

 attached to the lid covering over this chamber. A 

 small tube runs through the double bottom, and 

 projects a little below it ; the intention of which 

 is, to admit air into the place for the eggs. A 

 certain number of eggs, as fresh as can be obtained, 

 are now placed in this receptacle, which is lined 

 with cotton wool ; and the lamp being lit, the lid 

 on, and the thermometers duly regulated, incuba- 

 tion commences. It will be found at first very 

 difficult to maintain an equable temperature ; and 

 there is a constant risk of destroying the young 



