64 THE AMERICAN NATURALIST.  [Vou. XXXVI. 
also by many of the growing class of amateur naturalists. Detailed 
observation of familiar birds (such as Mr. Frank Bolles’s paper on 
* Sap Suckers ") will constitute an ever-increasing proportion of the 
literature of our popular ornithology, which has hitherto been marked 
by the not unnatural tendency to magnify the importance of a new or 
unfamiliar species. 
The paper, print, and binding are extremely attractive. There are 
fourteen full-page drawings by J. Smit. These drawings, if neces- 
sarily less accurate than the now omnipresent photograph from nature, 
possess a welcome softness and repose. R. H. 
A New Economic Entomology.!' — In a neat little volume of about 
three hundred pages, Prof. H. Kolbe has compiled an admirable 
treatise on Gartenfeinde und Gartenfreunde; it constitutes Vols. 
XXXIV-XXXVI of the great German *Garten-Bibliothek." This 
little venture of the author into the economic field will be of interest 
to American entomologists, as we are familiar with his great work, 
Einführung in die Kenntnis der Insekten. Notwithstanding the wealth 
of German literature on injurious insects and plant diseases, Garten- 
Jeinde und Gartenfreunde fills an unoccupied niche, for it deals with 
both the animal (principally insects) and fungous enemies in a way 
suited to the needs of every German gardener. 
After a brief discussion of the structure, the classification, and the 
various groups of insects, a dozen pages are devoted to remedial and 
preventive measures. Here the author introduces some of our Ameri- 
can methods, but it is evidently unfamiliar ground. Sirrine's poisoned- 
resin mixture is recommended for garden caterpillars, and the Bor- 
deaux mixture for nearly all fungous diseases; but our kerosene 
emulsion he calls * petroleumbrühe," and under “kerosene emulsion ” 
he gives the formula for our potash whale-oil Soap. Among reme- 
dies for plant-lice and thrips he mentions Paris green used dry. It 
is also an interesting fact that nowhere else in the book are any of 
our arsenical or other poisons recommended for killing insects; cur- 
rant worms are to be shaken off onto a sheet instead of poisoned, and 
the universal poison spray of American orchardists for the codling- 
moth and other caterpillars is not mentioned. Most of the remedial 
measures involve hand work. The discussion of preventive meas- 
ures is excellent, and the chapters on state, communal, and social 
! Kolbe, H. Gartenfeinde und Ga de. Die für den Gartenbau schüd- 
lichen und niitzlichen Lebewesen. Garten-Bibliothek, Bd. xxxiv-xxxvi. Berlin, 
Karl Sigismund, 1901. 8vo, iii-- 518 pp., 76 figs. 





