53 



frontispiece i)l;ite shows "The I'';ither of PeiiiisylvaniH Forestry," 

 the late J. T. Rothrock standing; beside another veteran, a mag- 

 nificent old tree. Nine other plates j^ive details of structure 

 and form of leaves, buds, flowers, fruits, etc., while 126 half-tfMie 

 figures illustrate forestry, conservation, fire destruction and fire- 

 protection, trees, and tree-trunks. In general the typography 

 is good and the proof-reading well done. It is unfortunate thau 

 better paper was not used for the half-tone figures; in this 

 respect the third edition was far superior. However, as a whole. 

 this book is without a peer as a convenient comprehensive 

 handbook of the trees of a limited region, such as the State of 

 Pennsylvania. 



In Part I, pp. I-57, the author has presented for the layman. 

 the student of trees, and the beginner in forestry, an excellent 

 little text on the general subject of trees and forestry in Penn- 

 sylvania. In this part of the book considerable improvement 

 has been effected over the third edition. There has been addect, 

 pp. 17-20, a discussion of "Forest Types in Pennsylvania," in 

 which it is stated that the following nine major forest types niciv 

 be found in the State: Spruce-Fir (Northern Swamp type): 

 Beech-Birch-Maple (Mixed Northern Hardwood) ; White Pine- 

 Hemlock; Aspen-Fire Cherry; Chestnut-Rock Oak-Pitch Pine; 

 Scrub Oak; Oak-Hickory; River Birch-Swamp Maple (River 

 and Swamp Hardwood) ; Sweet Gum-Willow Oak. The re- 

 viewer prefers to separate the Pitch Pine type from the Chestnut- 

 Rock Oak type. The Pitch Pine type seems to be more of a 

 pioneer type succeeded under slightly more favorable conditions 

 by the Chestnut-Rock Oak type. 



Under " Historic Trees of Pennsylvania" an interesting account 

 is given of the descendants of the famous Penn Treaty Elm. 

 Other historic trees are the White Oak Witness Tree and the 

 Lafayette Sycamore. The discussions of "When Trees Grow" 

 and "Do Trees Grow at Night?" present the results of some of 

 the author's original work showing that about 90% of the height 

 growth of Pennsylvania's trees is made in less than forty days of 

 spring and early summer and that most of this growth occurs 

 late at night. 



Part H is a Manual of Pennsylvania Trees, with keys, de 

 scriptions, and illustrations. Most of the trees treated are 

 native, but some, such as the Scotch Pine and the Norway 



