424 JOURNAL OF FORESTRY 



Glues Used in Airplane Parts. By S. W. Allen and T. R. Truax, 

 Forest Products Laboratory. Report No. 66. Preprint from Fifth 

 Annual Report, National Advisory Committee for Aeronautics. 

 Pp. 28. 



This report is a compilation of results on glues and gluing obtained 

 by the Forest Products Laboratory in its war-time study of this sub- 

 ject. Various types of glue, including animal, liquid, vegetable, casein, 

 and blood albumin glues are discussed in some detail but most empha- 

 sis is placed upon the casein and blood glues, for which formulas 

 worked out at the Laboratory are given. A table is given comparing 

 the sources, costs, properties, and uses of the different types of wood- 

 working glue, and methods of testing are described. 



The discussion of glues is of interest to foresters in view of the 

 value of glue as a means of conserving wood, and the possible influ- 

 ence which the development of a highly waterproof glue may have upon 

 forest crop rotation and selection. 



G. M. H. 



Handbook of Nebraska Trees. By Raymond J. Pool, Professor of 

 Botany, The University of Nebraska, Bulletin 7, The Nebraska Con- 

 servation and Soil Survey, March, 1919. 



Although less than three per cent of the area of Nebraska is covered 

 by natural timber, great interest is attached to the forest trees of this 

 state. Where timber is scarce its local value is greatly enhanced and 

 popular interest in arborescent vegetation is proportionately greater. 

 The "Handbook of Nebraska Trees," therefore, will be enthusiastically 

 received by the citizens of the state, who are fortunate in having the 

 subject presented to them by so competent an authority as Doctor Pool. 



The plan of the bulletin, the illustrations and maps are excellent and 

 the identification keys and botanical descriptions non-technical and 

 effective. The unscientific lover of trees and the professional den- 

 drologist will equally appreciate this valuable publication. Teachers 

 of nature-study and school pupils who may not wish to follow the ac- 

 curate methods of science in making their identifications can readily 

 search for a picture of the specimen in hand, while the trained botanist 

 will find ample material for study. Forest geographers will be espe- 

 cially interested because of the fact that the natural ranges of an un- 

 usually large number of important forest trees terminate in Nebraska. 

 Exclusive of about a dozen shrubby species which attain tree size 



