246 



SORGHUM. 



should be supplemented, wherever plenty of water can be had, by a diffusion 

 battery, whereby the whole of the sugar can be washed out of the cane by a 

 stream of warm v/ater (170° F.), which displaces and drives the sweet juice be- 

 fore it. This, however, can not be profitably done without a double-effect vac- 

 uum pan, whereby an economical evaporation is effected. 



The improved processes above described are not my own invention, but are 

 used in hundreds of factories here and in Europe. They can not be patented 

 or monopolized, and are not likely ever to be superseded, because they are the 

 result of a century of scientific research. 



Yours, respectfully, 



Hexry B. Blackwell. 



Professors Weber and Seovell report the following results of tlieir 

 analyses, in 1880 and 1881: 



TABLE .SHOWING THE DEVELOPMEXT AND CHANGE OP SUGARS IN SORGHUM. 



The analyses made in 1880, numbers 1, 3, 5, 6, 11, 12, 26, 27, 28, 

 and 29, were from cane grown upon the University farm. 



