BOTANICAL GAZETTE, 1892. PLATE XI. 
a ny —-t fy, = “ \ a _ = 
1: = ey : = Wl) ory oS 
| oo ai r i) — Aa ol 
I idwyi\ pi Melita Middbiiuahi' P we ' |) 
Lry 
ie 
Piaurne 2.—-Calture tube at rent. 
Culture tube in motion, 
