196 TIIK CALIFORNIA 



hollow, according to Mr. Goodrich's patented syst 

 These are my reasons for recommending hollow walls : 

 First, they are nearly one-third cheaper, as only 

 bricks are needed instead of three. Second, it is more 

 healthy for the worms. Third, and the principal, it 

 has a more even temperature, which is exceedii 

 favorable to silkworms. It is necessary for a complete 

 success that we do all we can to have in our cocooiu TV 

 a temperature as regular as possible. 



About eight windows will be needed on each side of 

 the first, and also of the second story. 



SHELVES, POSTS, ETC. 



The posts to support the shelves ought to be from 

 three to four inches in diameter and eight feet apart ; 

 the cross pieces to support the boards about one inch 

 and a half thick by three inches wide, and, of course, 

 just eight feet long. 



We can use inch boards sixteen feet long, the cross 

 pieces being eight feet apart, the board will be sup- 

 ported in the two ends and in the middle ; the boards 

 need to be in sufficient number to make the shelf eight 

 feet wide. 



The shelves need to be two feet six inches from one 

 to the other. The worms on the three first can be fed 

 while standing on the floor, and for the three others 

 above, at that point the cross piece needs to be longer, 

 so as to put a good board on the ends to take care of 

 them, and the same way in the second story. 



The galleries between the shelves, to take care of 



