MANAGEMENT OF INCUBATORS. 71 



sides of the machine, which consist simply of porous fabric, 

 and not of wood or metal. The same result is thus obtained 

 by widely different means, and the satisfactory results in 

 hatching are also similar. Indeed, when adequate attention 

 can be given, and only small hatches are required, these 

 primitive machines appear to suit many people best of all. 



Atmospheric incubators are however also made, mostly 

 of large size, in which the lamp fumes are all carried off 

 through flues, and do not enter the machine. The West- 

 meria is one example of this type (the same manufacturers 

 also make a tank machine), and Hillier's is another upon the 

 same principle. The makers of the latter consider they 

 have obtained an improvement in working by connecting 

 the chambers of two incubators together through a flue, 

 the two distinct regulators correcting or " averaging " one 

 another. 



It is impossible to describe in detail the various incu- 

 bators on the market, or to give precise directions for work- 

 ing, which vary according to the pattern, and are sent out 

 with each machine. It may be well to say that we have 

 satisfied ourselves concerning, we think, every one that has 

 held a market for two seasons, that so far each of these 

 has on many occasions hatched well. More depends upon 

 management and experience than on the precise pattern of 

 machine. At the same time we are bound to say that for 

 regular work on any scale, we have found the most regular 

 results, so far as they have reached us, to be from good tank 

 machines.* A few general points of management may, 

 however, be added, which are not always explained or 

 emphasised in the detailed instructions supplied to pur- 

 chasers. 



I. These latter should always be most carefully perused, 



* In America, on the other hand, the incubator most generally used 

 Is a hot air machine. 



