Ul 6 



With : 



DEPOSITED IM THE 

 HARVARD MEDICAL LIBRARV 



TRICHINiE IN SWINE. 



By Professor E. L. MARK, of Harvard University. 



[^Y'^ . 



began my examination of the 4ipgs kilted in the vicinity 

 of Boston in the autumn qf ^IffB^^* /-lt^:«r{jj?^then thought that 

 it miglit prove to be desiraJ[>lej<^'*can§^«%)n investigations 

 which could be better con^Sfitq^* ^ Chicago than in this 

 vicinity. My first examintttiOTig -ffere, therefore, confined 

 mostly to so-called Chicago "Bogs ; i, e. , such as were col- 

 lected west of Chicago, and shipped to slaughterers from that 

 point. But toward the end of the examinations made in that 

 year, and not included in the five hundred reported upon, 

 there was one small lot of hogs raised near Boston ^vliich 

 contained two trichinous individuals. That circumstance 

 suggested the possibility that the source of trichina3 among 

 American hogs might possibly be sought to advantage here, 

 instead of going to the West. The matter remained, how- 

 ever, without anything further being done by way of exam- 

 inations until 1883-84, when a renewed interest in the subject 

 was awakened. 



When examinations were resumed in 1884, it was upon a 

 somewhat different plan from that pursued at first. It seemed 

 improbable that success could be attained by any other 

 means than a careful study of all the conditions under which 

 the hogs were raised. I had found that it would be prac- 

 tically impossible to trace back the history of hogs shipped 

 from Chicago and other Western cities, because they were 

 generally collected over extensive territories, and no record 

 was kept of their origin. It therefore seemed best to limit 

 examinations to animals which were raised in this imme- 

 diate vicinity. The conditions under which they were reared 



