1018.] RURAL ENGINEERING. 689 



virus to have been destroyed and all contracted hog cholera on exposure. 

 Experiments indicate that hog cholera blood to which 0.75 per cent carbolic 

 acid has been added for 19 days or longer loses its virulence, as was shown 

 by a longer incubation period, the percentage of recoveries, and the slowing 

 up of the symptoms of tlie disease. 



Experiments with desiccated hog cholera blood demonstrate that the virus 

 can not be attenuated by the methods practiced, and that desiccated blood 

 exposed to daylight and room temperature is usually destroyed within a short 

 time. 



Work with sensitized virus indicates that it is possible to immunize hogs 

 against the disease in this way. Inoculation experiments with filtrates made 

 from rabbits show that the filtrable virus maintains its virulence for this 

 animal for a period of 7 days, but when passed through two rabbits it does 

 not produce a typical hog cholera temperature reaction. 



Notes on parasitic anaphylaxis and allergy, L. Van Es and A. F. Schalk 

 (North Dakota Sta. Bui. 125 (1911), pp. 151-193, pis. 2, fig. i).— The conclusion 

 of the Seyderhelms (E. S. R., 35, p. 80) that infectious anemia of the horse is 

 caused by a toxic substance obtained from Gastrophilus larvae led the authors 

 to conduct the investigations here reported in detail. In addition to ex- 

 periments with Gastrophilus larvae, which take up the greater part of the 

 work, experiments were also carried on with Ascaris megalocephala, Tricho- 

 dectes parumpilosus, Toxascaris limbata, Belascaris inarginata, Dipylidium 

 cnninnifi, Tccnia serrata, Gyropus ovalis, and G. porcelli. 



The results obtained have led to the following conclusions: "There is no 

 reason to believe that Gastrophihis spp. play a specific part in the causation of 

 infectious anemia or swamp fever of the horse. The severe intoxication fol- 

 lowing the injection of Gastrophilus material into horses is not due to a spe- 

 cial substance in the sense of the ' oestrin ' of the Seyderhelms. Such intoxi- 

 cations are purely a manifestation of anaphylaxis and in no way differ from 

 those precipitated by the use of any foreign protein. Many parasitic species 

 sensitize their hosts, who upon reinjection will re.spond by anaphylactic or 

 allergic reactions. The acutely toxic properties thus far found to be asso- 

 ciated with parasites owe their toxicity to the specific sensitization of the 

 animals injected with materials of parasitic origin. It is reasonable to assume 

 that anaphylactically intoxicating substances of parasitic origin can gain en- 

 trance into the body through the same channels which previously served for 

 the entrance of the sensitizing ones. By a more or less constant presence 

 of certain parasites the body may be constantly supplied by parasitic anaphyla- 

 toxins. It is within the range of possibility that such a form of intoxication 

 may give rise to certain more or less definite disease processes." 



On the treatment of lymphangitis in the horse, Chaussee (Rev. Gen. Med. 

 V6t., 21 (1918), No. 313, pp. 12-14) .—The author describes a method of cauteri- 

 zation in the treatment of lymphangitis and emphasizes the importance of 

 applying this treatment at the first indication of the disease. 



Bacillary white diarrhea, A. G. Lunn (Jour. Mass. Poultry Soc, 1 (1911), 

 No. 2, pp. 13-15). — This is a summary of information. 



RURAL ENGINEERING. 



Second report of the State engineer of New Mexico, .7. A. French (Rpt. 



State Engin. N. Mex., 2 (1914-1916), pp. 103, pis. 30).— This report deals with 



the work and expenditures of the ofiice of the State engineer of New Mexico, 



especially on roads and bridges, irrigation, and river protection for the period 



61347°— IS 7 



