Hog Lung-Worms rAd is) 
could living worms be found after two weeks. Other writers recom- 
mend a top dressing of kainit for the same purpose. Liberal applica- 
tion of these substances to pastures and yards, is the best method that 
can be recommended at this time. 
As infection is especially likely in young pigs clean bedding and 
quarters should be provided for them. Dr. R. A. Craig has found adult 
lung-worms in three-weeks-old pigs, which fact together with the ascaris 
infection already mentioned, would indicate that young pigs may be 
parasitized directly by eating worms which have been excreted by older 
hogs. Segregation of affected individuals, and the careful examination 
of newly purchased stock, for symptoms as coughing, arching of the 
back, ete., are additional factors that can be recommended. 
APPENDIX. 
This experiment is a summary of the pig-feeding tests already 
referred to. This data could not be incorporated into the main body 
of the report as the pigs were being used for another purpose at the 
time this experiment was conducted. Altogether six pigs were used, 
and were selected to approximate the same size and development. These 
were divided into two groups of three each, which for convenience will 
be designated as Group A and Group B. 
GROUP A. 
These three pigs were used as checks. No worms were fed them, 
and they were simply kept in a clean concrete pen so that the chance 
of infection would be reduced to a minimum. Due to the fact that all 
of these pigs were some three months of age before they were segre- 
gated and had ranged in an open hog lot during this time, absolute 
freedom from infection could not be achieved. Examination of the 
lungs of these pigs, killed at the same time as Group B, gave the fol- 
lowing results: 
Pig Right Lung Left Lung Male Worms Female Worms 
1 1 lesion none 3 5 
2 1 lesion none 2, 7 
3 1 lesion none 4 9 
GROUP B. 
The pigs of this group were fed lung-worm larvae at two different 
times, namely, on March 24 and May 12, 1921. The larvae were of 
different ages (from one to five weeks), and had been grown in culture 
plots in the laboratory. The feeding of these worms was effected by 
Pig Right Lung Left Lung Male Worms Female Worms 
1 3 lesions 2 lesions 39 57 
2 : 4 lesions 2 lesions 42 63 
3 General verminiferous| bronchitis 
