1889.] 



PUBLIC DOCUMENT — No. U 



125 



of the four hogs, was as follows : 12 : 17, 10 : 18, 40 : 85 

 and 40:98; or, combining all four, the ratio is 102:218. 

 It therefore follows that the examined portions of the pillars 

 contained nearly as many trichina} as all the other portions of 

 examined muscles put together, or nearly 50 percent, of the 

 worms discovered. But the degree of infection, neglecting for 

 the moment the disparity in the weight of different muscles, is 

 to be ascertained by dividing the number of parasites by the 

 number of muscles in which they are found. The average 

 degree of infection for all parts examined is therefore ex- 

 pressed by (218 -r- 6 =) 3(), while the degree of infection for 

 the pillars of the diaphragm is expressed by (102 -7-1=) 

 102. Consequently, the ratio * between the degree of in- 

 fection in all the muscles examined and that in the pillars 

 is 36 : 102, or approximately 1:3. But the muscles ex- 

 amined by elohow and Maximilian were principally those 

 which are most liable to be infected. It would evidently be 



* This ratio would not have been greatly altered had the " pillars " been regarded 

 as a part of the diaphragm, provided the examinations of the whole diaphragm had 

 resulted in finding the same number of trichinne as the average of the results from 

 pillars and diaphragm examined separately. This will appear from a comparison 

 of the following table of their results, and computations based on the above as- 

 sumptions : — 



Distribution oj TrichincB in Hogs, according to Johow and Maximilian.* 



* The first series of four columns exhibits the results as given by Johow and Maxlraillnn; 

 the second series of four columns shows what the result would have been on the above as- 

 sumptions. The ratio derived from the numbers 102 and 218 has been explained above. 

 The ratio upon the new asHumptions would be — dividing each total by the number of mus- 

 cles furnishing the trichinae— (i;J5 -r- 5 =) 27: (84 -f- 1 = ) 84, or 1:3.1; which is only 

 slightly in excess of the ratio obtained when pillars and diapbrau'in an> considorod m'pa- 

 rately. 



