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of trees. Special emphasis is laid on the species native to and 

 commonly introduced into Pennsylvania. A more general study 

 of the trees of the United States, especially those of commercial 

 importance, is made in connection with the native species. The 

 lectures are illustrated with fresh material, herbarium and mu- 

 seum specimens, photographs and lantern slides. Many of the 

 dried specimens are mounted in Riker Specimen Mounts. 



The field work of this course extends over the entire year. 

 This is necessary in order to know the trees not only in their 

 dormant or winter condition but also in the various stages of 

 their active or summer condition. An afternoon of each week 

 is given to field work and occasionally a long trip covers an en- 

 tire day. The field work consists of pointing out the distinguish-'' 

 ing characteristics and ecological factors of trees and of written 

 tests on identification. The written test covers about 750 speci- 

 mens each year. The woody flora about Mont Alto is very rich. 

 It comprises over 150 species of trees and shrubs. Numerous 

 ornamental trees and a small school arboretum are accessible. 



A collection of winter twigs w^th buds mounted on cards and 

 a key based on winter characteristics is required of each student. 

 A complete library of books is accessible including Sargent's 

 "Sylva of North America," 14 volumes, and Michaux's "North 

 American Sylvia," 5 volumes. 



(5) WOOD TECHNOLOGY AND TIMBER PHYSICS (Prof. 

 Illick), Junior Year — First Term — Lectures 2 hours, Labor- 

 atory 2 hours, Work Room 2 hours. 



The course covers the structural, physical, mechanical, and 

 chemical properties of wood and the uses which are and could 

 be made of the various species. The microscopic study of wood 

 elements is done in the botanical laboratory. A room 16x61 

 feet contains the collection of woods of the important tree species 



