The Hatching Apparatus. 2 7 



coats of a varnish, composed of two-thirds gas- 

 tar and one-third turpentine, in order to prevent 

 the oxidation of the lead, which is hurtful, and 

 also to avoid the growth of slime or " fungus " 

 on the wet surface of the wood. 



The last point to be touched upon is the 

 gravel. 



This should be small about the size of split 

 peas. It may often be found lying loose 

 on garden walks, and ought to be collected in 

 dry weather ; well washed, till the washing v 

 water runs off clear ; and then boiled in a sauce- 

 pan or copper, in order to destroy any germs 

 of life which may remain in it. When cool it 

 should be washed once more in filtered water, 

 and it is then fit for use. A few days before 

 eggs are expected, a thin layer is spread over 

 the bottom of the trough, just enough to prevent 

 its being seen, not more. The water may then 

 be turned on a little to season the apparatus, 

 which will then be ready for use. 



