1894. Open Letters. 251 
ing numerous visits (partly vain, partly successful) to the libraries. 
So his labor is i he time he needs for finishing 
estericht might be published more promptly a difference, for 
stance, for the bacteriological collaborator to have—as indeed he 
—on ree Separates every year from the authors themselves by t 
ing abroad their articles, but depend entirely on the staff of the 
Juhresbericht or of other periodicals of similar character—E. K@HNE, 
nedenau bei Berlin, Kirchstr 
If j On compass plants and twisting of leaves. ; 
th it be permitted, I would like to present a few remarks concerning 
€ nature of the Orsions in the leaves of the so-called compass 
Plants. These torsions were described as twisting by Mr. Meehan 
I 
ood r : 3 : : 
Mee €asons, interpreted as heliotropical torsions. ow, 
1“ tae that these torsions result from “a somewhat prolonged 
a ” 
rowth. 
r Meehan has, evidently, confounded different movements. Hav- 
to explaj Xperience with compass plants, I shall be ab’e, I ag 
stan, ain Mr. Meehan’s results. The question is very simple, an 
roi to the elements of vegetable physiology. i é 
*ss plants. Experiments (the literature was given In my 
ubject in the Deutsche Botanische Monatsschrift 11: 1. 
