434 BOTANICAL GAZETTE [DECEMBER 
diture the apparatus described in this paper possesses many times the 
efficiency of those, not counting cost of power. 
Should anyone desire to construct this apparatus, I shall be willing 
to give additional details; or I will gratuitously supervise the con- 
struction should any one wish to have the work done by Mr. Miller. 
In the latter case, application for construction should be made to 
Messrs. Eberbach & Son, Ann Arbor, Mich., into whose employ Mr. 
Miller has entered. 
UNIVERSITY OF MICHIGAN, 
Ann Arbor, Mich. 
