394 : BOTANICAL GAZETTE [MAY 
unduly into unsettled questions. It would seem, for example, that a modern 
treatise on the subject ought to make some use of the masterly contributions 
of Brown and EscomBeE on the energy and material exchanges of the green 
leaf, and of FItrInc’s telling work on geotropism. 
The order of treatment differs from that of most English and German works. 
The headings of the chapters are as follows: (1) nutritive reserves; (2) respira- 
tion; (3) fermentation; (4) assimilation of carbon; (5) mineral nutrition; 
(6) circulation of water; (7) transpiration; (8) latent life and development; 
(9) movements; (10) influences of environment; (11) physiology of the 
species. 
The agricultural significance of the subject is emphasized. In the main 
this is done by using data gained from a study of the economic plants. The 
book is not indexed, but this is partly cared for by a full table of contents.— 
WILLIAM CROCKER. 
MINOR NOTICES 
Das Pflanzenreich.—Part 43 contains the first portion of a monographic 
treatment of the Umbelliferae by Dr. HERMANN WoLrFr. The present part 
includes 9 genera of the tribes A pioideae and the heteroclitus Ammineae, to 
which are referred about 150 species. The body of the publication is occu- 
pied mainly with the genus Bupleurum, which is represented by approximately 
100 species, nearly all occurring in the northern hemisphere. One new genus 
(Ledebouriella) is proposed, being based on Rumia pena Ledeb. of uncer- 
tain native habitat and R. seseloides Hoff. from the Alta 
art 44 continues the elaboration of the Cashattiaces by Professor F. 
Pax and concerns only the tribe Adrianeae. The author recognizes 8 genera 
and 144 species, of which 34 are new to science. One new genus (Cephalo- 
crotonopsis) is described, founded on Cephalocroton socotranus Balf. f. from the 
steppes of northern Africa. Of the 8 genera constituting the tribe, the genus 
Manihot comprises by far the largest number of species (1 29), and these have 
their center of distribution in Brazil. 
Part 45 is devoted to a monographic consideration of the tribe Dendro- 
biinae of the Orchidaceae by the noted specialist Professor Fr. KRANZLIN. 
Seven genera are elaborated, the first in importance being Dendrobium. This 
genus, as here treated, includes approximately 600 species, numerous varieties, 
and over 80 hybrids; and its greatest specific diversity is in the Monsoon 
region of the Old World. The genus is divided into ten subgenera which are 
4 ENGLER, A., Das Pflanzenreich. Heft 43 (IV. 228). , cencomnege cai 
Bupleurum, Tinka et reliquae leans heteroclitae von Hermann WOLFF. PpP- 
214. figs.24 (155). M10.80. Heft 44 (IV. 147. II). Euphorbiaceae von 
F. ler PP. 111. figs. 35 (151). M5.70. Heft 45 (IV. 50. II. B. 21). Orchidaceae 
andrae-Dendrobiinae von Fr. 
KRANZLIN. pp. 382. 35 (327). M 19.20. 
ia: Wilhelm Engelmann. roto. 
