78 THE JOURNAL OF BOTANY 
It would be necessary to extend this notice unduly if reference 
were made to all the subjects treated of in this volume. The 
interesting question as to the origin of the chloroplasts—extrinsic 
or intrinsic with respect to the plant which they inhabit—is con- 
sidered, though with due caution, and the parasitic-algal theory 
yaa 1 
r e. 
n concluding this notice, attention may be directed to the 
excellent and numerous figures with which the book is illustrated. 
FREDERICK KEEBLE. 
Die Mneme, als erhaltendes Prinzip im Wechsel des organischen 
chehens. By Ricuarp Semon. Second, corrected edition. 
Large 8vo, pp. xv. 391. Leipzig: Engelmann. 1908. Price 
9 marks. 
Tuts is the second edition of a work published about three 
years ago, which did not come under our notice. A severely 
phony ”’ is rather caviare to the plain botanist, His attention is 
riveted at the outset by the singular title; and it is only by sundry 
dips into various parts of the book that he discovers that the above 
title is somewhat of a misnomer, as the work is really an inquiry 
into some of the remoter effects of stimulation. Even for scientific 
r 
render the exposition of “ chronogenous ecphory ” and its correla- 
tion with “inherited engramm ”’ som 
writers, both in the school of practical Bionomics, and in the field 
of bio-physical philosophy, who have amplified Herr Semon’s text 
FREpDERIC N. WILLIAMs, 
