RURAL ENGINEERING. 791 



The Thelazies, nematode parasites of the eye, A. Railliet and A. Henry 

 (Compf. Rend. Soc. Biol. [Paris]^ (JS (1910), Xo. 5, pp. 213-216). — Five species 

 of Tlielazia parasitic in uianinials are noted, of which 3 are describetl as new 

 to science. 



The Onchocerces. nematode parasites of the conjunctival tissue, A. Rail- 

 liet and A. Henry iCompt. Rend. Soc. Biol. [Purisi, GS {1910), No. 6, pp. 

 248-251). — Five species of Onchocerca are recognized of which 2 are described 

 as new. 



Filariae in the vitreous chamber of the eye of a camel — ophthalmia, A. S. 

 Leese (Jour. Trap. Vet. ScL, 5 (1910), No. 1, pp. S9-92. p(js. 2).— The case here 

 reported was due to a new species which Railliet has named TheJazia leesci. 



Some helminths of Python sebae, A. Railliet and A. Henry (Bui. Soc. Path. 

 Exot., 3 (1910), No. 2, pp. 9.'i-9S). — In a post-mortem examination of a python 

 Ivilled at the Pasteur Institute at Paris, a cestode and 4 species of nematodes 

 were found. 



Animal parasites and parasitic diseases, B. F. Kaupp (Chicfigo, 1910, 2. ed., 

 rev., pp. XII+9-211, pis. 11, figs. ?;?). — A second revised edition (E. S. It., 

 20, p. 883). 



A preliminary check list of the parasites of Indian domesticated animals, 

 S. H. Gaicer {-/our. 'Prop. Vet. Sci.. .j (1910). No. 1. pp. U.'i-H ) . — The parasites 

 of domestic animals which have been found in India are listed. 



RUKAL ENGINEERING. 



Traction plowing, L. "W. Ellis (U. S. Dept. Agr., Bur. Plant Indus. Bui. 110, 

 pp. Ji5, fig. 1). — The history and adaptability of steam and .j^asoliue tractors for 

 lilowing purposes in the United States are briefly outlmed and internal com- 

 bustion engines discussed. 



The 3 sections in which traction plowing is common are the Pacific Coast 

 States, the Northwestern States, and the Southwestern States. The equipment 

 for traction plowing and its cost are treated in such a way as to i)resent infor- 

 mation of value to one who operates or contemplates securing a traction outfit. 

 Disk and moldboard plows and steam and internal combustion traction engines 

 are discussed with special reference to their cost and the conditions to which 

 they are especially adapted and suggestions given as to the miscellaneous 

 equipment needed. 



The cost of operation, repairs, labor, watei" supply, plowing capacity, and 

 income from traction plowing outfits are fully dealt with. Tables show the 

 prices commonly charged for traction plowing, the estimated acre cost vtath 

 gasoline and steam plowing engines and with horses, and the relative number 

 and requirements of the various types of motive power. The cable system of 

 steam plowing is outlined. 



The average cost per acre of plowing with steam in California is estimated 

 at 85.3 cts., in the Southwest $1.14, in the Northwest $1.73 and in Canada 

 $1,898. while that of plowing with gasoline engines is set at $1,119 and $1,457 

 in the Southwest and Northwest, respectively. With horses the average cost 

 on the Minnesota farms reported was $1,201 for fall plowing and $1,258 for 

 spring plowing. 



An experiment in clearing logged-off land by the aid of a donkey engine 

 in 1908, W. H. Lawrence {Washington Sta. Bui. 1, spec, ser., pp. 3-15). — 

 Tests to determine the rapidity, effectiveness, and cost of clearing land with a 

 donkey engine are reported. 



A 13-acre tract, adjacent to a tract cleared as previously noted (E. S. R., 9, p. 

 295) was cleared, by the use of a donkey engine and stumping powder, of about 



