HATCHING-HOUSES AND APPARATUS. 45 



erroneously attributed to M. Coste, Professor of 

 Embryology in the College of France, the latter 

 gentlemen having only used it in connection with 

 his well-known experiments. It appeared to us 

 to afford every facility for examining, handling, 

 and keeping clean the spawn. As its use, on a 

 large scale, would necessitate the changing of 

 the site of our hatching-house and involve con- 

 siderable expense, we commenced upon a small 

 scale, but the results being perfectly satisfactory, 

 we, in 1870, rebuilt our hatching-house in a new 



Fio. 5. 



location, using only the trays ; and have never 

 regretted the change, considering that, at least, 

 one-half of the manual labor is saved by their 

 use. A pair properly arranged is represented by 

 Fig. 5. The box, or body of the tray (A), is of 

 galvanized iron, about No. 29 guage ; it measures 



