




REVIEWS. 377 
struct the view of the tank; they take up the room which is 
the least valuable of any, and yet can be seen to great ad- 
vantage. As the plants grow the tops of the branches meet 
and form an arch of green on all sides of the rockwork in 
the centre. They may be held in position, as was suggested 
by a friend, by fastening to them, by a thread or fine piece 
of string, a small stone of sufficient weight to anchor the 
plants and keep them in place. If this is not done, and 
the plants left to themselves or with the ends of their stems 
simply held down by a stone placed over them, we shall find 
them continually being turned upside-down by the mussels, 
turtles, or other live stock of the aquarium.— Zo be con- 
tinued. 
seme eae 
-< 

REVIEWS. 
» — 0c 
THE INJURY DONE TO Fonrsrs By Insects.*— Before giving our read- 
an idea of the contents of these volumes, we first express the 
agnificent work. It is a thorough monograph of the natural history of 
the forest insects, and the injury done by them to forest trees in Germany, 
by one of the best of living paturalists, who, by his previous works on 
volume e insects of the Vine, Curtis’ Farm Insects, Boisduval's 
Tecent work on horticultural entomology, and Harris' Insects of Massa- 
chusetts injurious to vegetation, are e uch works as these a 
of the labors of the naturalist, than any other class of books. In the 
elaborate and beautifully executed plates that enrich the two valumes 
before US is reproduced the tree as it stands in the forest, gnarled and 
Tted by one set of insects, its leaves curled and turned yellow, or 
red, by the attacks of others, with certain branches stripped by still 
others; and not only are certain trees and shrubs thus represented in 
: colors, but some of the plates represent parts of a forest, showing the 
*Die Waldverderbniss oder Iusektenfrass, Schalen Schia- 
: dauernder Schade, welcher dureh 
Ag und Verbissen an lebenden Waldbaumen entsteht. Von Dr.J. T. C. Ratzburg. 2 vol» 
Berlin, 1566-68, With fifty-seven plates and numerous wood-cuts. $20.00 in 
AMER, NATURALIST, VOL. IH. 48 
