BULLETIN OF THE BUSSEY INSTITUTION. 175 
of rye-straw, taken at random from the Boston market, and had the 
amounts of crude ash, total silica, and silica soluble in caustic soda de- 
termined in the same ways that these substances had been previously 
estimated in the ash of 4. arvense. ‘The results of this comparison are 
as follows: — 
Per cent of crude ash in rye-straw dried at 110° . .. . 4,14-4.86 
i - », sterile stems of HZ. arvense dried at 
gh oes Pe We we ie ey oy ep LOL Or 13.90 
Per cent of total silica in ash of rye-straw . . . .. . 39.72 
” ” ” Foe Orvense’ Petes a's), 30.21 
Per cent of SiO, dissolved by soda from ash of rye-straw . 30.42 
” ” 93 “i mF E. arvense 9.84-10.45-21.70 
Per cent of total silica in the rye-straw itself, dried at 110° 1.93 
9 9 rr E. arvense ,, we 4.31 
Per cent of soluble SiO, in the rye-straw ,, 4 1.26 
” ” E. arvense fs H 1.33-1.42-2.94 
I am indebted to my assistant, Mr. D. S. Lewis, for most of the 
analytical labor in this research. 
