BOTANY. 827 



and smaller, while if the injuiy takes place at a period just preceding 

 the opening- of the flowers, the flowers become yellow by the forma- 

 tion of chlorophyllan, and brown by the presence of tannins. In some 

 cases buds are severely injured while expanded flowers are unaffected. 

 In general, all flower buds opening during a fog perish. 



Outlines of plant life, C. R. Barnes {New York: Henry Holt ttr Co., 1900, 2>P- 

 SOS, figs. 250). — An abridged edition of Plant Life by the same author (E. S. E., 10, 

 p. 4i6). 



Some native forag-e plants of tlie State, E. V. Wilcox {Montana Sta. Bid. 22, 

 P2). 54-36). — Xotes are given upon a number of indigenous forage plants which are 

 valual^le as forage or for hay. Among those mentioned are sagebrush, wild licorice, 

 wild geranium, five-finger, lupines, and vetches. In addition, sweet clover is said to 

 have been introduced and become quite abundant in a number of localities. 



Some new species of the genus Crataegus and notes on some dichotomous 

 Panicums, W. W. Ashk {Xorth Carolina Sta. Bui. 175, pj). 109-116). — Descriptions 

 are gi\en of 21 new species of Crataegus and 7 new species of Panicum, belonging to 

 what is known as the Dichotomous group. 



The importance of the green leaf for the life of the plant, Z. Kamerling 

 {Reprint from Arch. Java Sttikerind. 1900, No. 5, pp. 20, p>U. 3). — A lecture delivered 

 in which is presented the general subject of the role of chlorophyll in plant life. — h. 

 M. r. 



Flowers and fruits of common trees and shrubs, F. li. Hillman {Nevada Sta. 

 Bui. 4'j, Nature Studies 2, pp. 15, figs. 24). — The general structures of flowers and 

 fruits are described and the flowers and fruits of a number of the more common trees 

 and shrubs are figured and discussed. 



Nuclear phenomena in certain stages in the development of the smuts, 

 E. A. Harper {Trans. Wisconsin Acad. Sci., Arts, and Letters, 12 {1900), ])t. 2, pp. 

 475-497, pis. 2). 



The resin ducts and strengthening cells of Abies and Picea, H. B. Dorner 

 {Proc. Indiana Acad. Sci. 1899, pp. 116-129, figs. 11). — Studies are rejiorted on the 

 structure of the leaves of the native species of fir and spruce, in which diagnostic 

 characters are sought in the resin ducts and strengthening cells occurring in them. 



Caoutchouc-yielding plants, P. Yax Eomburgh {Teysmannia, 9 {1900) , No. 7, 2^p. 

 342-345). — The author mentions 4 species of Urceola as producing caoutchouc of 

 good quality but in small cpiantity. U. brachtjsepala grows in 8 or 9 years to a height 

 of 13 meters with a steni circumference of 30 cm. From 2 average jalants of this 

 species he obtained 50 gm. of caoutchouc. U. javanica is characterized by its large 

 horn-shaped fruits, the weight of which is said to lie so great that thej^ sometimes 

 break down the trees upon which the plant finds support. This is a serious objec- 

 tion to the cultivation of the plant. U. elastica, which grows to great size, and 

 U. maingcdji each yield small quantities of good caoutchouc. — h. m. p. 



The influence of the assimilable nitrogen in the soil on the activity of the 

 root tubercles of leguminous plants, BRunxE {Landiv. Wclinsckr. Prov. SacJisen, 2 

 {1900), No. 40, p. 423). — A brief article describing, in a po^jular manner, the results 

 obtained by different investigators. 



Influence of weather conditions on the root tubercles of leguminous plants, 

 Bri-hxe {Landir. Wcltnsclir. Pror. Sarlisen, 2 {1900), No. 45, pp. 412, 4iJ).— These 

 notes, based on the work of Xobbe and Hiltner, treat of the relation between the 

 transpiratiozi of the plant and the activity of the root tubercles of legumes. The 

 autht ir concludes from the results obtained by these investigators that leguminous 

 plants for green manuring should be sown in season to allow them to develop} suf- 

 ficiently to insure activitv of the root tubercles. 



