268 Proceedings of Indiana Academy of Science 
important part in the metabolic functions of these parasites. This 
fact is important, because it may offer ultimately a means of control. 
For example, Kroening reports very favorable results in the treatment 
of sheep lung-worms, by injecting a 1 per cent solution of carbolic acid 
into the trachea. The ready absorption of volatile liquids or gases by 
these parasites, would offer a ready explanation for his results. Further 
experiments are, however, needed along this line, especially as regards 
administering, and the standardization of lethal doses of the antisepties 
used. 
DISTRIBUTION. 
Believing that a knowledge of the approximate frequency and dis- 
tribution of these parasites would shed some light upon their life his- 
tory, a systematic count was kept to determine these facts. Table 1 
shows the range and distribution for an entire year. The degrees of 
infestation of the different lots of hogs examined, have been reduced to 
percentages, and from these last the accompanying chart was con- 
structed. Turning now to the chart we see two points of rather light 
infestation. These are due to the fact that the hogs were all over a 
year old. These instances tend to uphold the results of other investi- 
TABLE 1. 
Prevalence of M. apri in Local Hogs. 
Date Examined Hogs Examined | Hogs Infected % of Infestation 
1920 | 
March 15 11 4 363 
March 16 31 12 . 387 
April 3 19 3 157 
April 10 37 17 450 
April 24 52 23 442 
May 4 28 4 . 142 
Sept. 13 62 48 774 
Sept. 20 47 34 .723 
Sept. 27 45 35 177 
Oct. 4 32 24 750 
Oct. 18 39 28 718 
Oct. 25 | 29 21 .724 
Nov. 1 25 | 17 . 680 
Nov. 8 62 44 .709 
Nov. 22 53 38 .716 
Nov. 29 45 32 711 
Dec. 6 42 29 - 690 
Dec. 13 28 18 642 
Dec. 20 | 35 21 . 600 
1921 
Jan. 3 43 27 .627 
Jan. 10 19 10 526 
Jai S17 30 17 566 
Jan. 31 27 15 555 
Feb. 14 42 } 17 . 404 
Feb. 21 57 26 456 
Feb. 28 74 28 378 
March 7 62 27 435 
March 14 83 32 385 
March 21 28 9 350 
March 28 35 10 .314 
April 11 62 29. .467 
April 18 60 24 "400 
May 2 74 35 472 
May 16 50 | 22 440 
Total number of hogs examined: 1458. 
Number of affected hogs: 780. 
Average percent of affected hogs: .534. 
