212 BOTANICAL GAZETTE [ MARCH 
tion of Dr. L. Errera, professor in the University of Brussels, and Dr. E. 
Laurent, professor in the State Agricultural Institute at Gembloux.? 
These plates are of the same size as the well-known chartsof Kny. The 
figures are not so numerous on each plate as to make them too smail for ordi- 
nary lecture room, such as those seating 100-150, but for large halls they 
would be too small. To obviate this difficulty the publisher has arranged to 
furnish lantern slides in colors for those desiring them instead of the plates. 
The illustrations have been drawn from photographs of actual experiments, 
and particular pains have been taken to show the condition at the beginning 
as well as at the end of the experiment. The drawings are well executed 
and the plates are in every way commenda 
In the accompanying text the authors have given a generally satisfactory 
account of the phenomena illustrated upon the plates. Though brief, these 
explanations are usually comprehensive and clearly stated. The too pages 
of quarto text with their 86 half-tone reproductions of many of the figures 
on the plates form therefore almost a text-book of physiology. The sub- 
jects treated and the corresponding plates are as follows: I, the chemical 
composition of the plant and nutrition by the roots; II, respiration; lll, 
nutrition by the leaves; IV, transpiration; V, saprophytic and parasitic 
plants and fermentation; VI, VII, carnivorous plants (Drosera, Dionzxa, and 
Nepenthes), and fixation of nitrogen by Leguminose; VIII, IX, growth 
of roots, etiolation, growth of stems in length and thickness; X, geotropism ; 
XI, heliotropism; XII, XIII, twining and climbing plants; XIV, the move- 
ents of leaves and flowers; XV, the variability of species as illustrated by 
ae races of cabbage. 
If all copies are printed on thin paper, as is that sent for notice, the 
plates would require mounting before they could be used safely as wall 
charts in the laboratory or class room. This, however, would not add very 
much to the cost, and the price at which the set is sold is ‘certainly very 
easonable—C. R. B. - 
eet Rt Aen 
_ SucH is the title of Professor Beal’s work whose second volume has just 
appeared,‘ almost ten years after the first. This volume is noteworthy as it 
is the first attempt to bring together in a Ia eg 1 the grasses north — 
_ ?Errera, L. et Laurent, E.—Planches de physiologie végétale. Quinze 
planches murales en sq Logie Saat descriptif francais, et explication 
des planches en francais en anglais. 4to. pp. 102. figs. 86. Bruxelles 
- Hlnai Latest, 20 i aro ys Bains 1897. 50 francs. 
“Beat, W. J—Grasses of North America. Vol Il. The grasses 
clase 
New York: Hemy Holt & €o. 1806. 
nee eee Pee ners ene 
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