AGRICULTURAL BOTANY. 727 



Maine Experiment Station of 511 samples of fertilizers and fertilizing materials 

 ofiEered for sale in Maine during 1915, together witli their guarantied analyses. 



[Analyses of fertilizers and cotton-seed meal], B. AV. Kilgore et al. (Bui. 

 N. C. Dept. Agr., 36 (1915), No. 11, pp. 85). — This bulletin contains the results 

 of the actual and guarantied analyses and valuations of 1,376 samples of fer- 

 tilizing materials, collected in North Carolina during the fall months of 1914 

 and tlie spring months of 1915, and of 109 samples of cotton-seed meal. 



Analyses and valuations of commercial fertilizers (Off. Bui. Ohio Agr. 

 Com., 6 (1915), No. 2, pp. 14-56). — Actual analyses made at the Ohio State 

 University of 518 samples of fertilizers and fertilizing materials offered for sale 

 in Ohio during 1914 are reported, together with their guarantied analyses. 



[Commercial fertilizers] (Off. Bui. Ohio Agr. Com., 6 (1915), No. 2, pp. 

 61-91). — This section contains a list of brands of fertilizers licensed in Ohio 

 from January 1 to July 1, 1915, statements covering valuations of commercial 

 fertilizers, and the results of actual analyses made by the Ohio State University 

 of 218 samples of fertilizers and fertilizing materials offered for sale in Ohio 

 during 1915. 



AGRICULTURAL BOTANY. 



Methods in plant histology, C. J. Chamberlain (Chicago: Univ. of Chicago 

 Press, 1915, 3. rev. ed., pp. XI +314, figs- 107). — This book, which is now in its 

 third edition (E. S. R., 13, p. 425) embodies a considerable number of additions 

 and improvements in technique so that the present volume is practically a new 

 %vork. 



[Report on physiological and pathological studies with plants], G. Hoster- 

 HANN (Ber. K. Gdrt. Lehranst. Dahlem, 1913, pp. 52-77, figs. 5).— This report 

 mentions studies carried forward on certain diseases of economic plants, on 

 electroculture, etc., and deals more in detail with the development of root systems 

 by plants in relation to given soils. It discusses also some studies on partheno- 

 carpy in tomato and other plants, and plant breeding in relation to withstanding 

 disease and winter cold. 



The pollen-presentation mechanism in the Compositse, J. Small (Ann. Bot. 

 [London], 29 (1915), No. 115, pp. 457-410, figs. 9).— The author claims that the 

 hypothesis that the appendages of the style branches and the apical and basal 

 appendages of the anthers are expressions of a tendency to economy of pollen, 

 which is limited only by the biological necessity of providing sufficient pollen 

 to insure fertilization, is supported by evidence in the shape of correlative 

 development of these appendages. Tables are given showing the relative fre- 

 quency of occurrence of the different types of styles and stamens in the various 

 tribes and the lines of development and specialization in the pollen-presentation 

 mechanism. A bibliography is included. 



A quantitative examination of the elements of the wood of trees in rela- 

 tion to the supposed function of the cells in the ascent of sap, H. H. Dixon 

 and Miss E. S. Marshall (Sci. Proc. Roy. Dublin Soc., n. ser., 14 (1915), No. 

 29, pp. 358-368). — In order to test the conclusions arrived at by Janse (E. S. R., 

 32, p. 221), the authors have made some measurements on the structure of the 

 conducting tracts of several trees, and the bearing of these on the hypothesis 

 put forward by that author is discussed. The results as shown are claimed 

 to lend no support to the hypothesis of Janse as to the intervention of the 

 living cells in the ascent of sap in stems. 



Formation of nodules, W. Giltner and C. W. Brown (Michigan Sta. Rpt. 

 1915, pp. 206, 201). — A brief account is given of a study of some of the factors 

 influencing the development of root tubercles on leguminous plants. 



