HORTICULTURE. 733 



tion, growing verj' large and yielding heavily. A carload of these onions 

 shipped to Chicago sold as well as the imported Spanish variety. 



It was found that young onion seedlings will stand a minimum temperature 

 of 9° F. above zero without injury, but that a zero temperature may kill some 

 of them. 



Chemical fertilizer experiments with truffles, E. Zacharewicz (Rev. Yit., 

 33 {1910), A'o. 850, pp. 350-353, flg. 1). — The author points out that the use of 

 organic fertilizers appears to decrease instead of increase the yield of truffles, 

 and cooperative experiments were conducted with a numl)er of truffle growers 

 to determine whether chemical fertilizers would have the same effect. 



The data secured indicate that a complete fertilizer composed of nitrate of 

 soda, jiotassium chlorid, and suijerphosphate of lime increases the yield to a 

 protitable extent and that these three ingredients improve tlie size, form, and 

 perfume of the truffles. Nitrate of soda used alone hastens maturity. The 

 conclusion is also reached that when chemical fertilizers are used the truffle 

 industry niay be pursued in conjunction with grape growing. 



Strawberry culture with descriptions and lists of varieties, W. T. Macoun 

 (Canada Cent. E.epi. Farm Bnl. 62, pp. 53, />/«. 2, figs. 2). — Popular directions 

 are given for the propagation and field culture of strawberries, including 

 varietal descriptions and informations relative to the quality, productiveness, 

 and general usefulness of the newer varieties in comi)arison with the best of 

 the older varieties, based on tests conducted at the Central Experimental Farm. 

 Remedies are also suggested for the more common diseases and injurious in- 

 sects to which strawberry plants are subject. The bulletin concludes with a 

 list of the varieties tested at the Central Farm from 18S7 to 190D with notes 

 on their character. 



Pineapple growing in Porto Rico, II. C. IIenricksen and M. J. Iorns (Porto 

 Rico »S7f/. Bill. S. Spa II is Ji Ed., jip. 7W/,S\ pis. 0). — The English edition of this 

 bulletin has been previously noted (E. S. li., 21, j). 45). 



The American grapes employed as stocks for reconstituting phylloxera- 

 infested vineyards in Italy, C. Fuschini (Lc Viti Amcricane nctla Prativa 

 delta Rico.stitusionc dei Yiyncti Filtossc'rati in Italia. Parma, 1910, pp. XIX-{- 

 lilj fiQS' 8). — ^A small practical treatise on viticulture with special reference to 

 the use of the American species as stocks for native grapes. In the introduction 

 consideration is given to the phylloxera infestation in Euroi)e and the nature 

 of the trouble, methods of combating it, etc. Succeeding chai)ters contain de- 

 scriptions of the best graft stocks and their principal cultural requirements, 

 together with specific directions for growing the American species, including 

 their propagation, grafting, forcing the grafted vines, and planting operations. 



A short bibliography on viticulture is appended. 



On the use of lime nitrogen in vineyards, F. Muth (Wcinbau ii. Wein- 

 handcl, 2S (1910), Ao. 13, p. 120). — Lime uitrogen was ti'ied in a vineyard in 

 Oppenheim in comparison with the usual sources of nitrogen, such as nitrate of 

 soda and ammonium sulphate. The data secured indicate that lime nitrogen 

 may safely be used as a source of nitrogen in vineyards. 



On the phosphoric acid content of grapes during their period of develop- 

 ment, E. HUGUES (Prog. Agr. et Yit. (Ed. VEst-Gcntre), 31 (1910), No. IJ,, 

 pp. /fl8-.i24, figs. 3). — Analyses are reported in which the author traces the de- 

 velopment of phosphoric acid in the skin, pulp, and seeds of grapes throughout 

 the active growing and ripening periods. 



Comparative results of inquiries made in 1907 and in 1909 on the viti- 

 cultural situation in the department of Herault, E. Durand (Prog. Agr. et 



