694 EXPERIMENT STATION RECORD. I Vol. 43 



The problem of the United States in regard to its increasing population is 

 involved with the rapid inuuigration by southern European peoples and the po- 

 tentiality of ethnic mixtures for strength or weakness to a race and to a civili- 

 zation. It is urged that a restriction of immigration, education, equitable read- 

 justment in many of our economic customs, and rational marriage selection and 

 birth rate are necessary to meet the problem of population for the future. 



Our national food supply: Limits of self-support, D. Hall {Jour. Min. 

 Agr. [London^, 21 (1920), No. 2, pp. 133-137).— It is indicated from a table for 

 the produce from an acre of arable land as compared with the prewar con- 

 sumption of a unit of the population of the United Kingdom that theoretically 

 an acre of arable land, assuming present average yields, could maintain one - 

 person for a year. Certain limiting factors which, however, prevent the main- 

 tenance at home of the population of the United Kingdom are outlined The 

 stand is taken that higher prices for agricultural products will follow a diminu- 

 tion in the total world supply, owing to the withdrawal of labor from agricul- 

 ture, and that the great bulk of the population will be compelled to increase its 

 consumption of bread, potatoes, vegetables, milk products, and pork. 



Cooperation in Denmark, L. Smith-Gordon and C. O'Brien (Manchester, 

 England: The Cooperative Union, Ltd., 1919, pp. 74)- — This is anotlier of the 

 international cooperative series (E. S. R., 43, p. 595), and contains a description 

 of the origin, growth, organization, and results of cooperation in Denmark. The 

 chapters take up early conditions in Denmark, the dairying industry, coopera- 

 tive credit societies, the distributive movement, types of agricultural societies, 

 and some results of cooperation. A brief bibliography is appended. 



The quit-rent system in the American colonies, B. W. Bond, je. (Neto 

 Haven: Yale Univ. P?-ess, 1919, pp. 492). — This is a detailed historical study of 

 the introduction, character, spread, and significance of proprietary and royal 

 quit-rents in the British colonies in North America. An introduction briefly 

 noting the character and importance in American history of this remnant of 

 feudalism has been written by C. A. Andrews, and a bibliography of sources, 

 both printed material and manuscript, of a general nature and relating to 

 individual colonies, is included. 



The child-welfare special (U. S. Dept. Labor, Children's Bur. Pub. 69 (1920), 

 pp. 19, pis. 8). — The special arrangement and equipment of a truck used by the 

 Children's Bureau as a traveling clinic, and the personnel, methods, and findings 

 of this means of teaching child-welfare in rural districts, are described. It is 

 said that widespread and interested response was met with on the initial field 

 trip, and that this method with certain adaptations is to be recommended for 

 effectively reaching rural inhabitants. 



Monthly Crop Reporter ([/. S. Dept. Agr., Mo. Crop Rptr., 6 (1920), No. 7, 

 pp. 61-76, figs. 6). — This number contains the usual monthly estimates of 

 acreage and production and brief articles, notes, and tabular data as to stocks, 

 farm and market prices, and the marketing of important agricultural products. 

 Among special reports are included one with a chart and tabulations, repre- 

 senting the present narrow price relations between hogs and corn, and an 

 article on the wages of farm laborers in Bessarabia. 



The Market Reporter (U. S. Dept. Agr., Market Rptr., 2 (1920), Nos. 4, pp. 

 49-64, figs. 2; 5, pp. 65-80; 6, pp. 81-96, fig. 1). — In these numbers are continued 

 the usual weekly and monthly summaries of movement, marketing, and prices 

 of specified commodities, and important classes of agricultural products, to- 

 gether with information on foreign markets. 



In No. 4, there are special articles on the satisfactory market position of the 

 American type of grapes and grape products and of alfalfa meal production in 

 recent years; a review of cold storage stocks; and a summary of the production,"'"' 



