RURAL ENGINEERING. 185 



The use of tartar emetic in the treatment of trypanosomiasis, A. Lavj:ran 

 U'ompt. Rend. Acad. »Sci. [I'liris], I'/J (I'JUS), Ao. J2, pit. 510-51.',). — Guinea 

 pifis infected with Trypanosoma evansi, T. gnmbiensc and the trypanosome of 

 Tojxo were treated with hyjiodermic injections of a 2 per cent solution of sodium 

 antimony] tartrate. The results were generally favorable, particularly when the 

 Mutimonyl salt was use<l with atoxyl. 



The Schizogregarines, II. V>. Fantiiam ( l'(irasitolo[/i/, 1 (1908), 'No. //, pp. 

 36D-)l.i, Jigs. !>. lUjin. I). — A review and a new classitication. 



RURAL ENGINEERING. 



Irrigation in Peru, E. Guarini (Mem. Dir. Fomentn [Peru], 1D07-S, vol. 2, 

 pp. 100-128, pi. 1). — In this report of the director of public works there is given 

 a general resume of the status of irrigation in Peru, including descriptions of 

 works under construction and proposed projects, and data relative to irrigation 

 I)nmping by gas engines and electricity. 



Earth slopes, retaining walls and dams; C. Prelini CNew York, 1908, pp. 

 IX+129, figs. 15). — As stated in the preface of this work, a large part of it 

 consists of graphical methods of solving problems concerning the slopes of earth 

 embankments, the lateral pressure of earth against a wall, and the thickness 

 of retaining walls and dams. The subjects of the chapters are The Stability 

 of Earth Slopes: Retaining Walls: Graphical and Analytical Methods; and 

 The Design of Retaining Walls. Dams are treated as a particular case of 

 retaining walls in which the material to be sustained is deprived of friction. 



The method of treatment is in the main based on the well-known theories, 

 but greater prominence is given to graphical than to analytical methods. The 

 graphical determination of eai'th slopes of uniform stability is presented in an 

 original way by the author. 



Progress reports of experiments in dust prevention, road preservation, 

 and road construction ( L. .S'. Dept. Agr., Office Pub. Roads Circ. 90, pp. 23). — 

 This circular contains descriptions of experiments conducted in IOCS by the 

 Office of Public Roads, together with further results of experiments previously 

 noted (E. S. R., 19, p. 11 SU). The 1908 experiments deal principally with the 

 treatment of roads during construction, while earlier work has been chietly 

 concerned with surface treatment of old roads. 



Eleven experiments were made at Newton, Mass. Ten of these were on dif- 

 ferent sections of an old macadam road, using asphaltic preparations alone and 

 with different flush coats of residual oil, water-gas tar, and water-gas tar and 

 coal-tarred sand. A mixture of oil, molasses, and lime was used in resurfacing 

 another road, this constituting the eleventh experiment. The total cost of 

 applying new material to these roads to a depth of 4 in. was, per square yard, 

 46.92 to 64.04 cts. with the asphaltic prei)arations, 47.28 cts. with the oil, 46.55 

 to 53.40 cts. with the tar treatment, and 02.34 cts. with the oil, lime, and 

 molasses. The difference between these costs and 40 cts. per square yard, 

 which is the average cost of macadam in that locality, is considered to repre- 

 sent the additional cost of using the binders. These costs are deemed to be 

 greater than if the work had been on long stretches, where more system in 

 construction could be employed. With resi)ect to the condition of these roads 

 after 3 months' wear, all are stated to be in good condition. 



At Independence, Kans., a street composed i)artly of slate-colored gumbo and 

 the i-«>nuijnder of bucksliot clay, and another comiiosed of disintegrated shale 

 and argillaceous sandstone were treated with an a'rtificial asphalt prei)aration 

 of specific gravity 0.981. The ctmstruction of these streets, exclusive of grad- 

 ing, cost 28.25 cts. per square yard. 



