MISCELLANEOUS. 197 



by side, the relation between tracti\-e force and velocity can be seen at every point of 

 the run, and from those portions of the graph where the velocity is constant and of 

 the required value a mean tractive effort can be obtained. After a number of exper- 

 iments have been performed curves can be plotted and empirical formulae deduced 

 for the various relations. 



"As the dynamometer has only been completed such a short time, the trials are as 

 yet only preliminary. The general results, however, tend to onnfirm those of pre- 

 vious investigators." 



A text-book on roads and pavements, F. P. Spaldixg {Nev> York: John Wiley 

 <i- Sous; London: Chapman i.i- JIall, Ltd., 190S, pp. YILI ^ 235, figs. 44).— This laihe 

 second revised and enlarged edition of this work. 



Highway construction in "Wisconsin, E. K. Buckley ( TT't.sronsm Geol. and Nat. 

 Hist. Surrey Bui. 10, 1903, Economic ser. 6, pp. XVL+339, pis. iC»6').— It is stated that 

 the information contained in this bulletin "is intended primarily fort-hose interested 

 in tlie construction and maintenance of streets in cities, towns, and villages in Wis- 

 consin, although a great part of the report is equally aj^plicable in the princijiles of 

 street construction and maintenance to rural districts. An atteii.pt has been made 

 to discuss impartially the different pavements, hoping to furnish unbiased and relia- 

 ble information as to their merits." Data are given as to methods and cost of con- 

 struction and maintenance, sources, quality, and methods of testing materials used in 

 highway construction, and durabiUty of different kinds of highways. Satisfactory 

 results were obtained from abrasion tests, in which the Duval abraiding machine 

 was used. The results of the tests of the cementing power of the finely ground stone 

 as determined by the Page method were very discordant and unsatisfactory. 



Machine threshing- and seed grains, M. Ringelmanx {Jour. Ayr. Prat., n. ser., 

 6 (1903), Xo. jS, pp. 4^, 43). — The injury to seed grain in threshing is briefly dis- 

 cussed. 



The comparative value of different forms of power in agriculture, H. Holl- 

 DACK {Fiddings Landw. Ztg., 52 {1903), Nos. 12, pp. 4I6-42O; 13, pp. 458-465, figs. 2).— 

 A general discussion. 



Modern silage methods {Salem, Ohio: The SUrer Mfg. Co., 1903, pip. 199, figs. 

 30). — A summary of information regarding the construction of silos and the prepara- 

 tion and use of silage. 



MISCELLANEOUS. 



Annual Report of the Office of Experiment Stations, 1902 {V. S. Dept. 



Ayr., Office of Experiment Stations Rpt. 1902, pp. 547 ■, pis. 48, fiys. 2). — This contains 

 a report on the work and expenditures of the agricultural experiment stations in the 

 United States for the fiscal year ended June 30, 1902, including a review of the work 

 of this Office; summarized accounts of the meetings of the Association of American 

 Agricultural Colleges and Experiment Stations and the American Association of 

 Farmers' Institute Workers held in 1902; a list of the publications issued by this 

 Offii'e and the experiment stations during tlie calendar year 1902; Federal legislation, 

 regulations, and rulings affecting agricultural colleges and experiment stations; 

 annual reports of the experiment stations in Alaska, Hawaii, and Porto Rico; a 

 review of irrigation investigations for 1902; and several articles relating to nutrition 

 investigations, agricultural education, and cooperative experiments. Parts of this 

 repoii are abstracted elsewhere in this issue. 



Annual Report of Idaho Station, 1902 {Idaho Sta. Rpt. 1902, pp. 24).— Thin 

 includes the organization list of the station, reports of the director and heads of 

 departments, a summary of meteorological ol)servations noted elsewhere, and a 

 financial statement for the fiscal year ended June oO, 1902. 



Fifteenth Annual Report of Massachusetts Station, 1902 {Ma.9sachusettsSta. 

 Rpt. 1902, 2U^. 163). — This includes a list of the ofticers of the station, an outline of 

 the more important work undertaken, a financial statement for the fiscal year 

 ended June 30, 1902, and departmental reports, parts of which are noted elsewhere. 



