448 EXPERIMENT STATION RECORD. [Vol.41 



sion that all instances of rough-shelled Japan walnuts have been found in 

 butternut territory. He concludes that the only reasonable explanation of this 

 remarkable change of the Japan walnut from smooth to rough-shell in this 

 country is that it hybridizes with the native butternut. 



Smith's chrysanthemum manual, E. D. Smith {Adrian, Mich.: Elmer D. 

 Smith d Co., 1919, 4- f^d-> PP- 75, pi. 1, figs. J^O). — In the present edition of this 

 manual (E. S. R., 28, p. 543), many of the chapters have been revised and 

 enlarged, giving more complete details. 



Progress in breeding freesias, W. Van Fleet (Jour. Internat. Gard. Club, 3 

 (1919), No. 2, pp. 232-239, pi. 1).. — A popular review of progress made in breed- 

 ing improved varieties of freesias, both hi this country and abroad. 



Spring-flowering stocks tried at Wisley, 1916—17 (Jour. Roy. Uort. Soc, 

 44 (iS'19), pp. 117-122). — Descriptions and notes are given on different varieties 

 of stocks tested at Wisley in 1916-17. 



Color in my garden, L. B. Wildee (Garden City, N. Y.: Doubleday, Page & 

 Co., 1918, pp. XV +410, pis. 24, figs. 3).:— In a previous book (E. S. R., 36, p. 

 142) the author gave her experience in planning and making an ornamental 

 garden. The present book, which is based on color effects developed iu this 

 garden, presents suggestions relative to the selection and arrangement of plants 

 with special reference to harmony in color and the development of a series of 

 color pictures throughout the season. The text is accompanied by numerous 

 garden pictures illustrated in color by A. Winegar. 



Report of the botanist, J. Dunbar (Proc. Soc. Amer. Flo7-ists, 32 (1916), pp. 

 164-173; 33 (1917), pp. 197-204).— The Ai'st of these is a report to the Society 

 of American Florists and Ornamental Horticulturists on new trees and shrubs 

 introduced from Western China to North America during the past 18 years. 

 Some 18 genera and 117 species, varieties and hybrids, all of which have come 

 under the author's personal care in the parks afe Rochestei-, N. Y., are consid- 

 ered. The second report deals with important hardy ti'ees and shrubs new or 

 rare in cultivation. 



Winter injury to ornamental trees and shrubs, F. S. Buck (Ann. Rpt. 

 Pomol. and Fruit Growing Soc, Quebec, 1918, pp. .^7-55). — An account with dis- 

 cussion following of the nature and extent of winter injury to trees and shrubs 

 in Canada during the severe winter of 1917-18, including lists of trees and 

 shrubs grouped according to the amount of injury which they sustained. 



FORESTRY. 



* 

 Lumber export and our forests, H. S. Graves (U. S. Dept. Agr., Off. Sec. 

 Circ. 140 (1919), pp. 15). — A discussion of the foreign demand for American 

 timber and other forest products, the available supply in this country, the prob- 

 able eifect of an increased export trade on this supply, measures that are 

 being taken in foreign countries to preserve and increase forest products, and 

 the great necessity of similar measures in this country. 



The author considers the situation to be serious to our wood-using industries 

 and to all consumers of forest products. He advocates appropriate legal and 

 administrative measures to insure adequate forest protection and the use of 

 such methods of cutting as will make possible forest replacement by natural 

 reproduction, together with a broad policy of public acquisition of forests. 

 National, State, and municipal. 



It is believed that the adoption of such measures will render safe and wise 

 the encouragement in a large way of the export of lumber and other forest 

 products. 



