430 EXPERIMENT STATION RECORD. [Vol.35 



decrease of humus content, but that this is not so likely to occur in heavier 

 soils. 



The sensitiveness of different lupines and other plants to lime, L. Hiltneb 

 (Prakt. Bl. Pflanzenhau u. Schutz, n. ser., 13 {1915), No. 5, pp. 53-59, fig. 1). — 

 The author reviews experiments by himself and others, the results of which 

 are taken to indicate that lime chlorosis of lupines and the chlorotic appear- 

 ances of other kinds of plants which are attributed to an excess of lime in 

 the soil may be obviated by spraying with solutions of iron salts. It is con- 

 cluded that the sensitiveness of lupines to lime is due to the injurious action 

 of the lime on the nodule bacteria. 



Magnesia and plant growth, B. C. Aston {Jour. Agr. [New Zeal.], 11 {1915), 

 No. 6, pp. 493-502, figs. 3). — The w^ork of others bearing on the subject is 

 briefly reviewed, and the rather general results of pot and field experiments 

 on New Zealand soils containing an injurious excess of magnesia are reported. 

 The results are taken to indicate that " if in a soil the amount of magnesia 

 exceeds that of the lime, judged by means of a strong solution of hydrochloric 

 acid, and such excess be deemed to be injurious, a great number of New 

 Zealand soils, according to analytical records, stand in immediate need of some 

 form of lime from this cause alone. ... If the excess be judged by a weak 

 acid solution, the number of known soils with an injurious amount of mag- 

 nesium in them becomes narrowed down to a few localities in the Nelson 

 Province. ... As to the remedy for excessive magnesia in the soil. ... in 

 extreme cases land plaster (gj'psum or sulphate of lime) or larger dressings 

 of ground limestone (carbonate of lime) should be applied." 



[Trials with bacterized peat and magnesium sulphate], J. Dunlop (Mid- 

 land Agr. and Dairy Col., Rpt. Field Trials Col. Farms, 1915, pp. 53-55). — 

 Tests of bacterized peat used on wheat, hay. and potatoes at the rate of 700 lbs. 

 per acre and of manganese sulphate used on potatoes at the rate of 25 lbs. 

 per acre gave negative results. " Apparently, therefore, little or no help is 

 to be got from either ' humogen ' or sulphate of manganese in increasing food 

 production." 



[Fertilizer analyses], R. E. Rose and F. T. Wilson (Fla. Quart. Bui. Dept. 

 Agr., 26 {1916), No. 1, pp. 53-93). — This section of the report contains actual 

 and guarantied analyses of 422 samples of fertilizers and fertilizing materials 

 offered for sale in Florida during 1915. 



Commercial fertilizers: What they contain and their uses, W H. STBOtrD 

 (Wisconsin Sta. Bui. 265 (1916), pp. 11, fig. 1). — This bulletin discusses the 

 composition, valuation, and use of commercial fertilizers, reports the results 

 of actual and guarantied analyses of 35 samples of licensed fertilizers and fer- 

 tilizing materials and analyses of 12 samples of unlicensed fertilizers and 

 ground limestone offered for sale in Wisconsin during 1915, and summarizes 

 the State fertilizer law. 



Miscellaneous samples, limestones, marls, shells, L. Heimbukger (Fla. 

 Quart. Bui. Dept. Agr., 26 (1916), No. 1, pp. 159-167).— This section of the 

 report contains the results of analyses of 47 miscellaneous samples of Florida 

 limestones, marls, and shells. 



AGRICTJLTURAI BOTANY. 



Pfeffer jubilee volume (Jahrb. Wiss. Bot. IPringsheim'], 56 (1915), Pfeffer- 

 Festschr., pp. XYI+8S2, pis. 11, figs. 6^).— This volume, in honor of Wilhelm 

 Pfeffer, commemorates the fiftieth anniversary of his doctorate and the seven- 

 tieth of his birth. In addition to the articles noted elsewhere in this issue, it 

 contains the following contributions: The Influence of Centrifugal Force on 



