KITKAL KNGIISTEERLNG. 87 



results are reported for 9 of the principal machines, including 1 steam engine 

 and 8 internal combustion engines, drawing and operating ground breaking 

 apparatus consisting of moldboard plows, disk plows, and revolving claw plows. 

 The plat of ground on which the tests were conducted consisted of a thin 

 gravelly layer of clay over calcareous rock and presented quite decided 

 undulations. 



The rules provided that in the first 2 days the depth to attain should be 15 

 cm. (6 in.). The results of these tests were fairly satisfactory considering the 

 unfavorable soil conditions, one of the machines effecting extraordinary pul- 

 verization, and all the machines dividing the soil well and covering the weeds. 

 The steam tractor presented the greatest fuel economy, but required more 

 labor in attendance. 



The 3d-day trials consisted of deep plowing from 25 to 30 cm. (10 to 12 in.), 

 but were on the whole a failure due to the unfavorable soil conditions. 



A comparison of these results with results obtained from previous tests 

 under more favorable conditions show that they are on the whole quite con- 

 cordant. 



The status of motor cultivation, O. Kasdokf (Rev. Assoc. Rural Uruguay, Jfl 

 (.1912), ^o. 10, pp. 717-763, figs. 70).— This article deals at length with the 

 problems encountered in motor cultivation in Uruguay, describes several differ- 

 ent types of motor plows and their respective effects on soil fertility, and gives 

 the results of tests of the economy and efficiency of both steam and internal 

 combustion motors for plowing, which indicate that both types are applicable 

 to certain conditions. 



A hand grain thresher, L. J. Bbiggs (U. S. Dept. Agr., Bur. Plant Indus. 

 Circ. 119, pp. 23, 2^, fig. 1). — A simple hand thresher is illustrated and de- 

 scribed which has proved useful in threshing small quantities of grain. The 

 grain is threshed by passing it between a rotating nibber-covered cylinder and 

 a stationary apron. The novel features include means for adjusting the 

 tension of the apron against the cylinder and a provision for the rapid and 

 easy cleaning of the machine. 



Spraying machinery accessories, W. H. Goodwin (Ohio Sta. Bui. 2^8, pp. 

 775-SOJi, figs. 38). — ^This bulletin describes and illustrates mainly the acces- 

 sories to spraying equipment which the author has found in his experience to 

 be most practical. The accessories are taken up in the order of sequence of 

 their use, beginning with the preparation of the spray material and following 

 it until it is delivered on the trees. This involves a discussion of strainers, 

 suction pipe, air chambers, pressure gages, relief valves, tank fillers, piping 

 and cutoffs, hose and connections, rod cutoffs, spray rods, and nozzles. Several 

 tables are appended giving data in regard to weight, size, shape, and capacity 

 of various commercial types of nozzles and test results in regard to the effec- 

 tive distance and the kind of spray formed by each nozzle. 



An all metal poultry cooling rack, M. E. Pennington and H. C. Pierce 

 {U. 8. Dept. Agr., Bur. Chem. Circ. 115, pp. 8, figs. 6). — An all metal portable 

 rack for the cooling and grading of poultry, rabbits, game, etc., is described and 

 working drawings and details of the principal parts given. 



The construction of dipping tanks for cattle (Rhodesia Agr. Jour., 9 

 (1911), 1^0. 2, pp. 208-211, pi. 1). — This article gives specifications of the work 

 to be done and the material to be used in the construction of a dipping tank, 

 and includes detailed working plans. 



Modem silage methods (Salem, Ohio, 1913, rev., pp. 251, figs. 37). — This 

 work deals with the construction and filling of silos, and gives in addition in- 

 formation regarding the composition and feeding of silage. 

 95099°— No. 1—13 7 



