140 EXPERIMENT STATION RECOED. [Vol. SS 



allowed to burn themselves out, a scale of colors facilitating an estimate of the 

 differences. 



Reports of fertilizer tests with ammonium sulphate, potassium nitrate, 

 sodium nitrate, and phosphoric acid are held to indicate that fertilizer treat- 

 ments have no influence on combustibility. 



Observ-ations on the combustion of different strains of tobacco produced 

 in Semampir and Mlessen, A. d'Angremond {Proefstat. Vorstenland. Tabak 

 [Dutch EaM Indies], Medcd. 24 (1916), pp. 27-39).— This reports observations 

 on 133 strains of tobacco, giving the average combustibility in seconds and indi- 

 cating the best strains and hybrids for these localities from the standpoint of 

 combustion. 



Comparison of varieties of turnips on 101 experiment fields from 1906 

 to 1915, P. Kkosby {Aarsber. Norges. Landbr. HoisJwles Akervekstforsok, 27 

 {1915-16), pp. 13Jf-lJ/2). — The results are tabulated and summarized, showing 

 that of the four principal varietal groups the flat-topped turnips included the 

 largest number of valuable varieties and gave the highest average yield of 

 dry matter in the roots, approximately 4,540 lbs. per acre. The Yellow Long 

 varieties produced about 4,373 lbs., and the White Globe and Yellow Globe 

 varieties approximately 3,955 and 3,855 lbs. per acre, respectively. The differ- 

 ent groups and varieties varied in dry matter production in different sections 

 of the country. Leaf production also varied with the group and with varieties 

 in the group in the various localities. The performance and behavior of the 

 varietal groups, as well as of the individual varieties, are briefly discussed. 



Wheat culture, J. W. Gilmore {California Sta. Circ. 112 (1911), pp. 8).— 

 Factors involved in wheat production in California are briefly reviewed, 

 emphasizing the importance of seed-bed preparation, maintenance of organic 

 matter in the soil, the use of good seed, the time and method of seeding and 

 amount of seed required, fertilization, and irrigation. 



The conversion of the weights of mechanical separations of corn, wheat, 

 and other grains into percentages, E. G. Boerner (U. S. Dept. Agr. Bui. 5H 

 (1917), pp. 21, figs. 2). — Tables are given and described for the conversion of 

 weights of mechanical separations into percentages for corn (E. S. R., 36, p. 

 836), wheat, and other grains. 



Percentage equivalents are given for separations of wheat weighing from 

 0.1 to 20 gm. taken from samples weighing from 25 to 65 gm., inclusive, and 

 covering the entire range of maximum and minimum limits of color, wheat 

 of other classes, damaged kernels, and inseparable impurities, and for sepa- 

 rations of corn weighing from 0.1 to 40 gm. taken from samples weighing from 

 240 to 260 gm., inclusive, and covering the entire range of maximum limits of 

 corn of other colors, damage, heat damage, and foreign material and cracked 

 corn as specified in the numerical grades of the United States standards for 

 wheat and shelled corn. The sampling device previously described (B. S. R., 

 33, p. 836) is also noted. 



The Colorado seed act, W. W. Robbins and G. E. Egqington (Colorado Sta., 

 Seed Lab. Bui., 1 (1917), No. 1, pp. 3-15, fig. i).— This bulletin discusses the 

 provisions of the Colorado seed act of 1917. The text of the act is included. 



Spraying for the control of wild morning glory within the fog belt, G. P. 

 Gray (California Sta. Circ. 168 (1917), pp. 7). — This forms a preliminary re- 

 port on the use of arsenical sprays as an herbicide in the control of the wild 

 morning glory in the coast regions of California. A stock solution composed 

 of 10 lbs. of granulated caustic soda (98 per cent), 20 lbs. of white arsenic 

 (arsenic trioiid 99 per cent), and water to make 5 gal. is to be diluted at the 

 rate of 1 gal. of the solution to 100 gal. of water. Damp, cloudy, or foggy 

 weather in October is deemed the best time to spray, a luxuriant growth of 



