90 EXPERIMENT STATION RECORD. 



The gagings are made in the same manner as at open sections, except that 

 the dep'th of the stream is taken as the distance from the bottom of the ice to 

 the bed of the stream. The soundings, however, are always referred to the 

 surface of the water in the holes. The vertical velocity curve method is 

 usually used. The tjTical curve is said to differ from that obtained from an 

 open-water observation in that it is drawn back more at the surface, whicli 

 results in two points in the vertical near 0.2 and 0.8 of the total depth below 

 the bottom of the ice at which the thread of mean velocity occurs under an 

 ice cover. Both mean velocities at these two depths are said to give fairly 

 accurate results. 



The importance of chlorin determination for the superintendence and 

 judgment of drinking water, F. Malmejac {Compt. Rend. Acad. Sci. [Paris], 

 158 {1914), No. 9, pp. 650-652; abs. in Chem. Zenthl, 1914, I, A"o. 15, p. 1458; 

 Wasser u. Ahwasser, 8 (1914), No. S, p. 481).— It is shown that the variation 

 in chlorin content of drinking water is accompanied by corresponding varia- 

 tions of the organic content of animal origin and of the bacterial content. 

 Fixed relations are, however, not established. 



Preparing land with dynamite, C. D. Woods (Maine Sta. Bui. 236 (1915), 

 pp. 62, 63). — Experiments in progress since 1912 with a moderately heavy loam 

 indicate that the use of dynamite for soil preparation, vertical drainage, and 

 tree planting has not been in any way advantageous. 



Silos and Silage, H. L. Blanchard (Washington Sta., West. Wash. 8ta. 2Io. 

 Bui., 2 (1914), No. 2, pp. 4-11, fig. i).— General information regarding the 

 construction and filling of the common types of silo Is briefly given. 



A movable hog house, W. Hislop (Washington Sta. Popular Bui. 85 (1915), 

 pp, Jf. figs. 4). — This enumerates the essential features of an ideal hog house 

 and illustrates and briefly describes the A-shaped house. A bill of material and 

 estimate of cost of this house is given, the latter totaling $11.17 on the basis 

 of local retail prices at Pullman. Wash. 



Homemade cow stall, H. L. Blanchard (Washington Sta., West. Wash. Sta. 

 Mo. Bui., 1 (1913), No. 4, p. 16, figs. 2). — A homemade stall used by the author 

 for about 20 years is briefly described. The distinctive features are a sliding 

 feed box and a crosspiece which compels the cow to stand near the gutter, 

 thus promoting cleanliness. 



Trap nests and ttieir use, V. R. ]McBride (Washington Sta., West. Wash. Sta. 

 Mo. Bui., 2 (1914), No. 5, pp. 10-12, fig. 1). — The use of trap nests is briefly 

 discussed and types installed at the station are illustrated and briefly described. 

 Lessons from the 1906 test fence, E. F. Ladd and W. F. Washburn (North 

 Dakota Sta. Paint BuL, 1 (1915), No. 6, pp. 73-79, figs. 14).— This paper presents 

 the deductions from the experiments with the so-called 1906 test fence described 

 in a previous report (E. S. R., 20, p. 1089). A progress report of these experi- 

 ments has also been noted (E. S. R., 30, p. 691). 



Ochre was found to be unsatisfactory as a priming coat. The character of 

 the lumber usetl influenced to a large extent the lasting quality of the paints, 

 better results being obtained on soft pine than hard pine, western cedar, or 

 fir. None of the mixed paints showed any superiority over the two single 

 pigments used in the test. 



" The indications are that it is far safer to use as a priming coat the same 

 paint as is to be applied in the finishing coat, properly thinned with oil and 

 turpentine, rather than to use ochre; and white lead (basic or sublimed) well 

 thinned with pure linseed oil and turpentine has shown good quality and is 

 well adapted as a priming coat. . . . Test fences properly constructed and 

 with paint applied in accordance with the usual methods of practice, con- 



