126 



STATE BOARD OF HEALTH. 



[Jan. 



unfair, therefore, to put the average infection of the whole 

 body as higli as that of the muscles examined. Perhaps it 

 would not be unreasonable to assume that the muscles less 

 liable to infection — e. g., those of the legs and back — 

 would have been comparatively free from parasites ; and 

 since, on the whole, the muscles not examined greatly ex- 

 ceed in weight those which were, it would probably be not 

 far from the truth to suppose that the including of such 

 muscles in the examination would have reduced the average 

 infection of the whole body to half the average infection of 

 the muscles which were examined. Upon that assumption 

 the pillars of the diaphragm would be six times as badly 

 infected as the muscles of the body taken as a whole. 



This result agrees fairly well with the examinations of 

 Kiihn, cited by Leuckart (" Untersuch. iiber Trichina 

 spiralis," 1866, pp. 105, 106) . Kiihn examined fifteen differ- 

 ent muscles from each of three hogs, with the total result that 

 the diaphragm — not the pillars alone — contained 25 per 

 cent.* of all the worms found. Now, if the worms had been 

 evenly distributed, he would have found in the diaphragm 

 only (100-^15 = ) 6 J per cent., instead of 25 per cent. 

 That is to say, the diaphragm is four times as badly infected 

 as the average of all the muscles examined. Since the 

 muscles examined by Kiihn were not limited to those which 

 usually show the larger proportion of trichinae, it is fair to 

 assume that the proportions which he found would hold 

 good if every muscle of the body had been examined. That 

 proportion is not very far from the results which the exami- 

 nations of Johow and Maximilian would indicate, according 

 to the view which I have taken of their investigation. In 



muscles falling 



Kiihn's case,* however, the fact that the 



* Kahn's results, which are slightly defective, from the omission of the ear-muscles 

 and the extensors of the thigh, — they not having been uniformly examined, — are 

 as follows : — 



Muscles. Trichina. 



Per cent. 



Diaphragm 25.3 



Shoulder blade 14.0 



Lumbar region, 11.3 



Larynx . 8.5 



Flexors, hind leg, 7.0 



Neck, 4.8 



Tongue, 4.7 



Cheek, 4.4 



Muscles. 



Trichina. 

 Per cent. 

 . 3.6 



Eye 



Belly 3.6 



Extensors, fore leg, . . . .3.1 



Nape 2.6 



Flexors, fore leg, 2.5 



Intercostal 1.7 



Dorsal, 0.3 



