FIELD CROPS. 429 



growing spontaneously with tlao forms generally grouped under the name Oryza 

 sativa in Asia. 



Of the numerous spontaneous species in Asia only one is said to resemble 

 O. sativa. From Africa four species are described, some of which are cultivated, 

 that differ in taxonomic characters from the cultivated rice usually referred to 

 O. sativa. Among the species described from Africa are O. latifolia, 0. brevilir 

 gulata, 0. brachtjantha, and O. longistaminata. 



Plant chimaeras, M. Skene {Sci. Prog. Twentieth Cent., 9 {191ff), No. 33, pp. 

 127-134). — ^ popular account is given of a number of plant chimteras, or gi*aft 

 hybrids, as they are sometimes called, beginning with Cytisus adami and em- 

 bracing a number of other forms, among them the so-called graft hybrids of 

 Solanum produced by Winkler (E. S. R., 21, p. 320). 



Spore plants, L. K. Rosenvinge (Sporeplanterne {Eryptogamerne) . Copen- 

 hagen: G yldcndalske Boghandel NordisJc Forlag, 1913, pp. 7+38S, figs. 513). — 

 This is a discussion, arranged according to class, order, family, and genus, of 

 typical or important thallophytes and archegoniates, with a glossary and index. 



Flora of the vicinity of New York, N. Tatlob (Mem. N. Y. Bot. Gard., 5 

 (1915), pp. VI +683, pis. 9).— This volume deals with the distribution of the 

 flora of southeastern New York, Long Island, the State of Connecticut, eastern 

 Pennsylvania, and the State of New Jersey. The edaphic and climatic factors 

 are discussed at length. 



FIELD CROPS. 



Field management and crop rotation, E. C. Parker (St. Paul, Minn.: Wehb 

 Publishing Co., 1915, pp. 507, figs. 100). — This book is primarily a text-book, 

 but may serve also as a reference book. It covers the subjects of history, rota- 

 tions and plans, commercial fertilizers, and experimental evidence, with chap- 

 ters on soil productivity, soil inoculation, seed selection, fungus diseases, and 

 weeds. A group of problems and practicums concludes each chapter. 



A hand chart of farm crops, S. D. Semenow (East Lansing, Mich.: Author, 

 1915, folio). — ^A chart containing data as to time of seeding, method and depth 

 of planting, preparation of seed bed, soil adaptability, time of harvest, average 

 yield per acre, and disease and enemies, compiled for 39 of the more important 

 field crops. 



The work of the Huntley reclamation project experiment farm in 1914, D. 

 Hansen ( U. S. Dept. Agr., Bur. Plant Indus., Work Huntley Expt. Farm, 1914, 

 pp. 23, figs. 8). — ^This bulletin reports work in progress (E. S. R., 31, p. 828) 

 conducted by several offices in the Bureau of Plant Industry cooperating with 

 the Montana Experiment Station. Climatic and crop conditions for the year 

 are noted, including plans of the experimental farm and a detailed statement 

 of the numbers of live stock on the project. Yields in crop rotation experiments 

 that include alfalfa, sugar beets, potatoes, oats, wheat, corn, and flax are given. 



Results of pasturing hogs on alfalfa show a return of $76.88 per acre, and 

 on corn of $62.72 per acre in i)ork produced. The average net values of the 

 crops of alfalfa and nurse crops from different methods of seeding alfalfa, 

 with nurse crops cut for hay and for grain, early seeding, late seeding, and 

 seeding in 18-in. rows, are, respectively, $45.68, $54.46, $43.86, $39.96, and $33.73. 

 The cost of production for the various methods ranged, respectively, as follows: 

 $34.12, $32.18 to $37.86, $29.04 to $36.06, $26.02 to $33.78, and $23.23 to $31.46 

 per acre. 



The results of a time-of-harvesting test show that there were no consistent 

 differences in the yields of the second crop due to delay in harvesting the first 

 crop. On plats where four crops were harvested the total yield was much 



