CONTAGIOUS DISEASES OF DOMESTICATED ANIMALS. 271 



from Tennessee, without finding any infected, and Dr. E. W. Steger ex- 

 amined 180 tit Xasbville, Teun., all of which were also free. Dr. William 

 Myers examined 330 hogs at Sau Antonio, Tex., finding trichinie in but 

 2, or 0.6 per cent.* 



Dr. H. J. Detmers has examined from August to December, 1883, for 

 the Department of Agriculture 3,331 at Chicago; of which 80, or 2.4 

 per cent., were found to be infected. Of this number ],12(J were from 

 unknown districts of the West; 46, or 4.08 per cent., containing tri- 

 chinae; 50 were from Michigan, among which 4 contained the parasite; 

 831 were from Iowa, of which 10, or 2.27 per cent,, were infected; 50 

 were from Dakota, of which 1 was infected ; 520 were from Illinois, 

 among which were 7, or 1.35 per cent., containing trichinte ; 304 were 

 from Wisconsin, with but 2 infected, or O.GO per cent.; 350 came from 

 Nebraska, having but 1 infected, or 0.28 per cent.; 100 were from Min- 

 nesotii, and were free from infection. 



In the laboratory of the Department of Agriculture specimens from 

 300 hogs have recently been examined, and of these 5, or 1.66 per cent.,^ 

 were found to contain this parasite. 



We have above the records of the examination of 18,8S9 hogs from 

 various parts of the United States, of which 517, or 2.7 per cent., con- 

 tained trichin;e. It is evident from these records that a considerable 

 l)r()p()rtion of the hogs from some sections of the country are trichinous, 

 while those from other sections are practically free from infection. 

 While it may be difficult to outline the trichiuiB districts and to trace 

 the infected anim;ils to the farms on which thej' were raised, it is be- 

 lieved that such a study would do much to clear up the origin of tliia 

 infliction. 



In addition to the inspections detailed above, Dra. Osier and Clement 

 examined at Montreal 1,000 hogs tVom Western Canada, fiiuling 4 in- 

 fected. t The French inspectors report the examination of 103,528 pieces 

 of American meat, containing 2,080, or about 2 per cent., infected, t The 

 German insi)ectors, during the year 1880, examined 78,880 pieces o 

 American pork, of which we have record, and found 1,265, or 1.6 jjer 

 cent., to contain trichnse; and in 1881 they examined 96,485 pieces, find- 

 ing trichina' in 2,414, or 2.5 per cent. § 



Taking all the examinations of American pork thus far made, both at 

 home and abroad, and we have a total of 298,782, during which trichinae 

 were found 6,280 times, being 2.1 per cent., or 1 to 48. 



It would seem that this number of pieces, considering the close agree- 

 ment between the results reached by American microscopiscs over this 

 limited territory and those obtained by the inspectors of American pork 



* Report of American Health Assoc, vol. 7, p. 13^-145. 



+ Aii Iiivesti<;ati()ii into the Parasite in the I'oriv Supply of Montreal, 1863, page (5. 

 {Cliatin, La Trichine et hi Trichinose, Paris, ld83, page 217. 



vS II. Eulenberg. Ueber die iui Jahre, 1881, auf Trichinen uud Fiunen uuter.suchteu 

 Schweinc. Viertel.jahrsehrifr, f. Gar. Med., &c., 1882. 



