892 EXPERIMENT STATION RECORD. [Vol. 41 



deiuancl for increased grain crops during the War, and brief reports on the 

 conditions of such winter-grown truck crops as potatoes, onions, and cabbage 

 are given. 



The figures given for the trend of factory production of dairy products indi- 

 cate that between 1914 and 1918 the production of cheese decreased 25,000,000 

 lbs., and the condensed milk production doubled, it having increased from 

 875,000,000 lbs. to 1,675,000,000 lbs. With the latter increase has ^one a con- 

 siderable increase in our export of these products and it is predicted that, to 

 supply their needs, the countries of Europe probably will continue to import 

 dairy products, at least for a time. A chart illustrates the balance of trade 

 in dairy products. 



Tables give the number of cattle, hogs, and sheep before the war and in 

 either 1918 or 1919 in 14 of the most important countries engaged in the 

 international trade (imports and exports) in meat and meat products prior to 

 the war, not taking into consideration the number of animals in what consti- 

 tuted the former Empires of Austria-Hungary and Russia or in the Balkan 

 States, for which it has not been possible to obtain recent figures, also the 

 number of pounds of beef, pork, mutton, and goat meat produced in this country, 

 as estimated from the slaughter of animals for the past six calendar years and 

 for the first six months (January to June, inclusive) of 1918 and 1919. It is 

 estimated that during the five years before the war exports of meat and meat 

 products from the United States averaged about 1,100,000,000 lbs. annually, of 

 which pork and pork products constituted about 81 per cent. During 1915, 

 1916, and 1917 the average annual exports rose to above 1,800,000,000 lbs., of 

 which pork and poi'k products constituted 76 per cent. In 1918 the exports 

 of meat and meat products rose to 3,058,000,000 lbs., of which pork and pork 

 products constituted 74 per cent. During the first six months of 1919 the ex- 

 port of meat and meat products amounted to 1,957,600.000 lbs., or 15 per cent 

 more than during the first six months of 1918. Of this amount pork and pork 

 products constituted 88 per cent. The conclusion is that our exports of meat 

 will undoubtedly decrease somewhat in the future, but that the bulk of Euro- 

 pean imports of pork must continue to come from the United States. 



Crop cycles in the United Kingdom and in the United States, H. L. Mooke 

 {Jour. Roy. Statis. Soc, 82 (1919), No. 3, pp. 373-389, figs. 8).— This paper 

 presents the methods employed in ascertaining the existence of periodicities 

 which furnish evidence that the yield of the leading cereal crops in the United 

 Kingdom tends to vary in well-defined cycles, and that, as far as the statistics 

 of the two countries are comparable, the crop cycles in the United States tend 

 to synchronize with those of the United Kingdom. 



Crude figures for the yield per acre of wheat, barley, and oats from 1884 to 

 1914 in the United Kingdom, exclusive of the Isle of Man and Channel Islands, 

 were converted into index numbers of which the base was the mean yield for 

 the 10 years, 1890 to 1899. The curves platted and periodograms constructed 

 are shown. In all cases the principal maxima are nearly at 1890, 1898, 1906, 

 and 1914, and the secondary maxima are about midway between these years. 



Study of the periodicity of rainfall in the Ohio and Mississippi River Basins, 

 1839 to 1910 ; the yield per acre of cotton in the United States, 1882 to 1914 ; 

 and of crops of corn, wheat, barley, rye, buckwheat, potatoes, hay, and cotton 

 in the United States gives finally 8-year cycles in which the maxima occur at 

 about the same dates as those of the crops in the United Kingdom. 



Returns of produce of crops in England and "Wales with summaries for the 

 United Kingdom (Bd. Ayr. and Fisheries [London], Agr. Statis., 52 (1917), 

 No. 2, pp. 37-58; 53 (1918), No. 2, pp. 33-56).— These reports continue informa- 

 tion previously noted (E. S. R., 37, p. 392). 



