1920] AGRICULTURAL BOTANY. 729 



Liiiu'stoiie and fertilizer experiments, W. S. Blair (Canada Expt. Fannn 

 h'ljt. IDli), p. 91). — Tests at Kentvllle, N. S., of the aKricultural value of ground 

 raw limestone on clover in i-acre plats showed that 2 tons of limestone sup- 

 plemented by i ton of slag produced a considerably greater average increase in 

 the hay crop than * ton of slag alone and a slightly greater increase than 2 

 tons of limestone alone. 



Tests with wheat showed a striking increase in both straw and grain when 

 the wheat was both limed and fertilized. Liming alone gave greater increased 

 yields than fertilizing alone. 



Does burnt lime destroy organic matter? E. O. Fippin {Natl. Lime Aa.'ioc., 

 Trade Bnl. 107 (1920), pp. J,, fig. i).— Data from different State agricultural 

 experiment stations are reviewed to show that burnt forms of lime do not have 

 a direct destructive effect upon soil organic matter or humus, and that their 

 use is permis.sible and desirable. 



Agricultural lime, IM. F. Miller and H. H. Krusekopf (Missouri Sta. Bui. 

 Ill (1920), pp. 2.',, fi(js. S).— This is a revision of Bulletin 14G ( E. S. R., 37, 

 p. 42S). 



Fertilizer control in 1918, C. O. Swanson, W. L. Latshaw, and L. T. 

 A.\ijekf:g(i (Kdiisd.s Sta. Insp. Circ. 10 (1919), pp. 9). — This circular contains the 

 results of actual and guarantied analyses of 49 samples of fertilizers and fer- 

 tilizer materials collected for inspection in Kansas during the spring and fall of 

 1918, together with a list of fertilizer dealers registered in the State. 



AOEICULTURAL BOTANY. 



Genera and supergenera, A. S. Hitchcock (Science, n. scr., 52 (1920), No. 

 1335, pp. 107, 108). — The author dis'us.ses stmie of the problems that arise from 

 the strict adoption of Linna^an genera of gra.sses. 



Species formation, from the phylogenetic and group standpoint, H. de 

 Vries (Flora \_.Jenu], n. .scr.. 11-12 (1918), pp. 208-226).— This is a discussion of 

 facts obsei-ved and deductions therefrom in connection with the nppearance and 

 behavior of mutants and mutating forms, most of which have been dealt with 

 in pi'evious communications. 



Heredity in CEnothera, O. Renner (Flora [Jena], n. ser., 11-12 (1918), pp. 

 641-667, figs. 18). — The author notes various findings and conclusions as result- 

 ing from crossings among CEiioihcra s[tp. and among their descen<l!ints. 



Floral variations in the ox-eye daisy, L. Blaringhem (Compt. Rend. Acad. 

 Sci. [Paris], 169 (1919), No. I,, pp. 193-195). —Y\o\n\ variations in the ox-eye 

 dai.sy, Leucnntheinuiii vulgare (Chrysantheimim leucnnthcmxim) , under condi- 

 tions very favorable to vegetative development are outlined as noted in some 

 individuals. 



On the periodicity of Hyacinthus orientalis, A. H. Blaauw (Mcded. Land- 

 tjouwhoogsch. [Wageningcn], 18 (1920), No. 1, pp. 1-82, pis. 5, figs. 10; also in 

 Lab. PlantcnphysioL, 3 (1920), pp. 1-82, ids. 5, figs. 10). — This is a summary of 

 a study on the life history of the new bud of H. orientalis, begiiming in sunniier 

 and continuing over nearly two years, also of the influence of various factors on 

 flower formation. 



Variegation in tree foliage, E. KCster (Milt. Dnit. Dcndrol. Gesell., 28 

 (1919), pp. 85-88. figs. 8). — This is an account of ob.served forms and eflfects as 

 regards decoloration or discoloration in trees, among which in this regard the 

 maples are conspicuous. 



Nitrogen metabolism and yellowing in leaves of Tropa'olum majus, A. 

 Meyer (Flora [Jena], n. ser., 11-12 (1918), pp. 85-127, figs. i7).— This deals with 

 the color changes occurring in the life course of leaves of normal plants, the 



