The Hydro-I ncubator. 



183 



of having a lamp or gas jet under the boiler, and, by the 

 natural circulation of water, that in the upper compartment 

 of the tank gradually passing through the boiler and thus 

 being re-heated. 



By the use of this boiler twice a day for about an 

 hour each time, the machine can be worked ; and, though 

 this system requires care, yet with that care it is both simple 

 and easy. The makers of the hydro-incubator are Messrs. 



Fig. 8. — Christy's Hydro-Incubator, with Circulating Boiler. 



Thos. Christy and Co., of Fenchurch Street, London, who 

 have by their enterprise done a very great deal to solve the 

 problem of artificial incubation and rearing, and their 

 machines are now well known all over the world. In a place 

 where hot water is not to be obtained easily, and in sufficient 

 quantity, we know of no better machine than theirs, and we 

 should in such a place strongly recommend it, as there is no 

 danger of fire, no vitiation of the atmosphere, and there are 

 no regulators to get out of order. 



