1919] HORTICULTUEE. 339 



from other crosses will be needed before any definite statement can be made. 

 May it not be possible that there is a certain type (or types) in Palestine 

 tliat, when crossed with others, may frequently produce the wild type?" 



Third biennial report State seed commissioner, 1917-18, 11. J. Leth {Idaho 

 Sta. [Pub.], 1018, pp. 12, fig. i).— This report, prepared by P. A. Wenger and 

 C. B. Hobson, shows that 1,979,290 lbs. of agricultural seed was actually in- 

 spected during the biennium, that 3,037 samples were examined for purity, 

 and that 310 samples were tested for germination. 



HOETICULTURE. 



Fruits, vegetables, and flowers, F. D. Gakdneb et al. (PJiiludelphia : The 

 John C. Winston Co., 1918, pp. 279, figs. 135). — A popular reference work on the 

 culture of vegetables, fruits, nuts, and flowers prepared by a corps of specialists 

 in the subjects presented. 



In part 1, under the general heading horticulture, forestry, and floriculture, 

 the successive chapters deal with the principles of vegetable gardening, the 

 culture of specific vegetables, the farm vegetable garden, vegetable forcing, 

 mushroom culture, medicinal and aromatic plants, growing fruit on the home 

 plantation, the culture of small fruits, grapes, pome fruits, stone fruits, citrus 

 fruits, nuts, miscellaneous tropical fruits, the farm woodlot, beautifying the 

 home grounds, and window gardening. Part 2 comprises a treatise on plant 

 diseases and insect enemies and their control. Part 3 contains tables of weights, 

 measures, and agricultural statistics. 



[Fourth a.nnual report of nursery and market garden experimental and re- 

 search station in Hertfordshire in 1918], A. B. Listeb (Expt. and Research 

 Sta., Waltham Cross. Ann. Rpt., 4 (1918), pp. 36, figs. 4)- — A progress report on 

 cultural and manurial experiments with cucumbers and tomatoes (E. S. R., 

 40, p. 147). Some data are given on a study of sources of error and uncer- 

 tainty in determining experimental results in the greenhouse with special 

 reference to the position of the plants in the house. The study of the effect 

 of sterilization on crop yield was continued. Of 6 methods of treatment ap- 

 plied in two houses, 5 of them yielded opposite crop results in the one house 

 to what they did in the other, thus indicating that sterilization is of no benefit 

 in producing greater crop yield other than in destroying disease organisms. 



A progress report is made on a study by Mrs. D. J. Matthews of the use of 

 sterilizing agents in the control of tomato soil pests. A preliminary note is 

 also given on a study of methods of controlling the noctuid moth (Iladena 

 oleracea). 



The evolution of the commercial greenhouse in relation to horticulture 

 past and present, W. R. Cobb {Ann. Rpt. Hort. Socs. Ontario, 13 {1018), pp. 

 128^131, fig. 1). — A brief review of some of the more important changes in 

 greenhouse construction. 



[Report on experiments in lettuce growing], S. B. Johnson {Ari:;ona Sta. 

 Rpt. 1017, pp. 4-^4-4^1) ■ — Tests of the New York and Iceberg varieties of 

 lettuce secured from several different seed firms and of 47 other varieties are 

 reported in tabular form. The essential difference between seed of the same 

 variety from different sources was the difference in germination percentage. 



Experiments conducted with organic and inorganic fertilizers, though for the 

 most part inconclusive, did show that the plat receiving stable manure at the 

 rate of 20 tons per acre was the first to come to maturity and produced the 

 best lettuce. 



Under irrigation conditions planting the lettuce on ridges gave better re- 

 sults than planting on the level. Planting in single rows api^ears to be more 



