1194 EXPERIMENT STATION RECORD. 



Boad improvement in the United States (Good Roads May., n, scr., 10 

 (1909), \o. 3, lip. 8o-i)J, /igs. 7.) — This is a coiui)ilatiou of brief reports sub- 

 mitted from about one-half of the States, showing the progress made during 

 VMS and the i)rosi)ects for 1909. 



Superheated-steam plowing' machine ( Manchincii Zlij., G ( I'JOS), Xo. 23, pp. 

 iiUl-JK). fif/s. o). — Tbi.s is a (les(ri])ti<>n of a [ilowing uiaebine using superheated 

 steam, wbieb is meeting willi considerable success in Germany, (ireater power 

 witli less water and coal consumption than witb the ordinarj- steam engine is 

 claimed for it. By an attaclnnent so placed that the hottest gases as they 

 leave the fire box pass through the tubes a superheat of 300° C. is obtained. 

 The arrangement of the pipes and connections is explained and illustrated in 

 the article. 



In addition to tbe .suiierheating arrangement this locomotive embodies many 

 ofber novel features. 



New milking machine systems, R. Gf.orgs (Maschincn Ztg., 7 (1909), No. 3, 

 pp. 20-31. flu><. 3). — Tbe evolution of the milking machine and the ditliculties 

 encountered in its practical application are discussed briefly. There follows a 

 description of the principles and construction of two new tyr>es of machines, 

 witli an account of experience with them. 



Machine milking' and its practical application, G. Ellbrecht {Mcelkeritid.f 

 21 (1908), So. .50, pp. 996-100.'i). — A general discussion of tbe subject, with 

 descriptions of a number of milking machines, among them being several new 

 types. 



Milking machines (Xorsk Landniandshlad. 27 (1908). Xo. .'//, pp. .303-506, 

 figs. 3). — Special mention is made of two Swetlish machines, with illustrations 

 of both in operation. 



Ventilation of poultry houses, K. J. J. Mackenzie and E. J. Russell (Trans. 

 Highland and Agr. Soc. Scot., .5. so:, 20 (1908), pp. 87-100, figs. 3). — Experi- 

 ments with different types of poultry houses showed that in the presence of 6 

 to S parts of carbonic acid per 10.000 volumes of air the birds were apparently 

 healthy. Nine volumes is believed to be tbe maximum content that a poultry 

 house should contain. In order that this degree of purity may be obtained 

 each bird must be allowed 40 cu. ft. of air per hour. In building a poultry 

 house each bird should be allowed 10 cu. ft. of space and there should be top 

 ventilation. 



RURAL ECONOMICS. 



Cyclopedia of American agriculture. Farm and community, L. II. Bailey 

 ET AL. iXru- York, 1909. vol. .',, pp. Xir+6.50, pis. 25, figs. i6J).— This is the 

 last of the series of volumes devoted to agriculture in the United States and 

 Canada, the other volumes having been previously noted (E. S. R., 20, p. 778). 



This volume contains 10 chapters which treat, respectively, of the agricul- 

 tural wealth of North America, the historical evolution of North American 

 agriculture, including a list of current agricultural periodicals, phases of the 

 agricultural sbift. the natural resources of agriculture, land and labor, business 

 organization in agriculture, social and service associations, education by means 

 of agriculture, governmental and legal aid and control, and biographies of 

 persons who have aided in the development of agriculture in North America. 



The articles under the different chapters have been prepared by specialists, 

 and particular attention is given to tbe bearing of the agricultural industry 

 on tbe economic and social welfare of communities. Bibliographies are ap- 

 pended to many of the articles. 



