at: 
60 THE JOURNAL OF BOTANY 
NOTICES OF BOOKS. 
Handbuch der Systematischen Botanik. Von Dr. Ricuarp R. vy. 
WettsTEIN. Bad. ii, Th. 2. 8vo. pp. 161-394, mit 995 fig. 
in 165 Textabbildung. Leipzig u. Wien: Deuticke. 1907. 
Pt. 3. Mk. 
THE present instalment of Professor Wettstein’s text-book 
A A 
contains the first part of the account of the Angiosperms. About 
the series Polycarpice of Dicotyledons. We cannot, however, 
agree with Dr. Wettstein’s statement on p. 196 (first paragraph), 
when he supports his argument as to the secondary position of 
Monocotyledons with the statement that the group contains no 
f imi imitiv 
ever view we may take as to the position of the Helobi 
biee. ; 
The author accepts the two great subclasses of Dicotyledons 
HOw gene recognized, an earlier one—Choripetale, and an 
ard present-day Gymnosperms 
as derivative forms admit that it is in that division that 
must seek the transitional stage between Pterido hytes and 
arg | characters are the following: a woody habit, 
llen-tube, and a relatively long interval between pollination and 
fertilization. It is among the monochlamydeous series of Chort- 
di ~ ads oi aracters are found, and these are regarded as 
representing the more primitive types of the subclass. The 
