264 Screntific Intelligence. 
Ill. Borany anp ZooLoGy. 
1. Report on the Forests of North America; by Cuartes 8. 
Sarcent, Arnold Professor of Arboriculture in Harvard College. 
Vol. ix of the Report of the Tenth U.S. Census. Washington, 
1884. pp. 612, 4to, with 39 maps in quarto; also an Atlas of 
16 elephant folio maps, illustrating distribution and character of 
forests.—A great work faithfully done. There are first a dozen 
ages of general remarks on the forests of the country as to dis- 
0 
full index included) of what is called a Catalogue of the Forest 
Trees of North America (exclusive of Mexico) with remarks upon 
seems to be exhaustive, and the synonymy nearly so, The popular 
names follow, in a separate line and type. The geographical range 
is then given, occasionally with citation of authorities. Then the 
height of the tree and diameter of its trunk, in a general way. 
Finally the character of the wood is specified, including its specific 
gravity and the amount of ash. 
Part Il, The Woods of the United States, fills over 250 pages 
with the results of investigations (by Mr. Sharples) upon the 
qualities of the wood of the different trees, the specific gravity 
and ash, the fuel value, strength both tensile and under compres 
he fo tables. A d 
sion, etc., largely in the form o 8 ouble quarto map 
during the census year. : 
Part III takes up The Forests of the United States in their 
shows the position of the forest, prairie, and treeless regions of 
its the relative average density of existing forests. The gener 
index fills thirty pages, that of the Catalogue of the species and 
their synonyms, twenty more. : 
Evidently no labor nor pains have been spared. Considering 
the elaborate way in which the synonymy and the bibliography 
have been given, one must wish that a certain amount of popular 
botanical description had been added, either under each species 
