CHAP. X[. EGGS ARTIFICIALLY HATCHED. 



135 



another entrance at the front part of the oven, or 

 lower room, being- tlien used for the same purpose, 

 and sliut inmiediately on his quitting it. By way 

 of distinction, I call the vaulted (a) the upper 

 room, and the lower one (b) the oven. In the 



No. 443. 



Modern ovens for hatching eggs. 



Fig. 1. I'lim of the building, showing the form of the upiier rooms A A, the entrance 

 room (; (J, and the passage F. At art are the f.res. cc the aperture com- 

 municating with the oven. 



2. Section of the same, sliowing the upper rooms A and 15. 



3. Plan of upiier room, in which the fires arc placed at a b, and cit. 



4. Lower room, in which the eggs arc placed. 



5. 6. Sections, from the back and front of the upper and lower rooms A and 15. 



former are two fires in the troughs a b, and c d, 

 which, based with earthen slabs, three quarters of 

 an inch thick, reach from one side to the other, 



K 1. 



