No. 376.| REVIEWS OF RECENT LITERATURE. 293 
lines of investigation, and one which speaks strongly against the too 
frequent custom of basing broad generalizations on isolated and 
unverified observations. 
Food Plants of Scale Insects. — Though sometimes misleading, 
lists of the host plants of parasitic fungi or of the food plants of 
vegetable-feeding insects are always helpful when properly used; and 
a list of the food plants of scale insects, by T. D. A. Cockerel, in 
volume xix of the Proceedings of the United States National Museum, 
will be acceptable to students of this group. The author states that 
it is to be understood that the plants given as hosts have been infested 
in many cases only since they have been cultivated, and suggests that 
it would be desirable to distinguish in every case between the endo- 
genetic and exogenetic Coccids on a plant, and also between those 
exogenetic in a state of nature and those only so in cultivation. 
Timber Pines. — The timber pines of the Southern United States 
form the subject of an important contribution from the Division of 
Forestry of the Department of Agriculture. Though a revised edition 
of an earlier series of monographs, the present publication appears 
with almost the value of a new work. In it Pinus palustris, P. hetero- 
phylla, P. echinata, P.. teda, and P. glabra are quite fully considered, 
from the standpoint of forestry and mechanics, as well as that of 
botany. To the teacher of economic botany such excellent illustra- 
tions as those of Plate VIII, showing the method of “turpentine 
orcharding in Louisiana,” are next in value to an actual field 
demonstration. 
New England Botanical Club._The New England Botanical 
Club, an association of gentlemen interested in the flora of New 
England, which holds monthly meetings in Boston and has begun the 
formation of a New England herbarium, has recently issued a taste- 
fully prepared pamphlet containing its constitution, with a list of its 
officers and members. Thirty-seven resident and twenty-four non- 
resident members are enrolled. 
Botanical Garden in Dahlem. — The plans for the new botanical 
garden in Dahlem, near Berlin, the distance of which from the 
teaching departments of the great Berlin University is lamented by 
1 The Timber Pines of the Southern United States. By Charles Mohr, Ph.D. 
Together with a discussion of the structure of their wood, by Filibert Roth. 
Bulletin No. 13 (revised edition), U. S. Department of Agriculture, Division of 
Forestry. Washington, 1897. 176 pp. 27 pl., 4°. 
