86 EXPERIMENT STATION EECOED. 



the nature of capital invested, as if tlie operation is judiciously and properly 

 carried out the cost will doubtless be recoverable with interest in the form of 

 increased crops." In some cases the cost of operating on a large area may be 

 considerable, but it is not necessarily essential to treat the whole area, as in 

 many cases only the poorest portions need be exploded. 



A self-steering farm motor, H. I. Washburn (»S'ci. Amcr., 110 {lOlJf), No. 

 15, p. SIS, figs. 2). — An apparatus is illustrated and described which, when 

 attached to a specially made farm motor, controls the steering mechanism. 



The testing of lubricating oil for internal combustion motors, G. Lumet 

 (Compt. Rend. Acad. Sci. [Paris], 158 {1914), No. 3, pp. 112-115; ahs. in Rev. 

 8ci. IParis], 52 {191 Jf), I, No. 5, p. 155). — A machine is described for determining 

 the coefficient of friction of lubricating oil, and tests regarding the theory of its 

 use are discussed. 



The draft of plows, S. S. Godbole {Poena Agr. Col. Mag., 5 {1914), No. S, 

 pp. 113-116, fig. 1). — The author enumerates the factors influencing the draft 

 of plows and describes the manner in which each operates. Comparative tests 

 of three types of plows with respect to the factors influencing the draft showed 

 that none stood first in every respect. 



Relation between electricity and threshing machine fires, A. H. Shoe- 

 maker {TJircshcrmen's Rev., 23 {1914), No. 9, jyp. 16, 18, 20, fig. J*).— It is 

 claimed that almost all of the unexplained thresher fires originate from the 

 combustion of inflammable dust caused by electrical discharges between certain 

 parts of the machines. 



Forms for concrete work, H. H. Rice {Farm Engin., 2 {1914), No. 2, pp. 24, 

 25, figs. 4)- — Forms adapted to farm structures are described and illustrated. 



Stables, M. Ringelmann {Jour. Agr. Prat., n. ser., 21 {1914), ^os. 24, PP- 

 1.55, 156, fig. 1; 25, pp. 194-196, figs. ^).— Information is given regarding the 

 proper arrangement of stables for breeding and fattening stock, work animals, 

 and milch cows, with illustrations. 



Silos and silage, N. A. Negley {Alabama Col. ma. Circ. 26 {1914), PP- 81-94, 

 figs. 3). — This circular, reporting cooperative work between this Department 

 and the Alabama Station, gives popular information regarding the construction 

 of concrete and stave silos including biUs of material. 



It is stated that the concrete and stave silos are the two most common types 

 in Alabama. The stave silo is recommended where material for concrete can not 

 be obtained at a reasonable cost and where lumber is cheap. The pit silo is 

 not recommended if it is at all possible to build one of the other types. 



It is stated that raw coal tar thinned with gasoline to the consistency of 

 paint should be applied to the inside of the stave and concrete silos, and also to 

 the wall of the pit silo if it is plastered. 



The Missouri silo, C. M. Long {Missouri Bd. Agr. Mo. Bui., 12 {1914), No. 8, 

 pp. 39, figs. 19). — General information regarding the construction of silos is 

 presented in a popular way. 



The so-called Missouri silo is particularly recommended as being a cheap and 

 satisfactory type of wooden silo for the renter or less well-to-do farmer. This 

 silo is usually made of flooring put together in sections with wooden hoops. It 

 may be taken down when empty, and it is claimed that it can built for about a 

 dollar per ton capacity. 



The Gurler and solid concrete silos are also described as homemade silos. 



Proceedings: Conference of farmers institute and short course workers 

 on permanent and sanitary farm improvements {Chicago, 1913, pp. 116, figs. 

 122). — Permanent and sanitary farm improvements using concrete as the main 

 structural material are discussed in these proceedings. 



