F. H. Stewart 
201 
The attack of pulmonary congestion was not recorded previously 
as I believed it was unconnected with the experiment. 
Expt. 9 1 . On 27. ix. 15, the pig being 2| months old, from this date to 2. xn. it 
received repeated doses of eggs of human Ascaris but no eggs appeared in the faeces. 
On 5. I. 16 eggs of Ascaris of the pig, 68 days old, were given. On 10. I. ditto, 
73 days old. On 18. i. ditto, 20 days old. On 5. n. ditto, 17 days old. On 23. II. 
no eggs were found in the faeces. On 27. rr. eggs 39 days old were given. On 27. ni. 
no eggs occurred in the faeces. On 30. IV. the pig was killed and no ascarids found. 
Experiments on the Infection of Pigs with the Larvae from Mice. 
In these experiments it is difficult to obtain a sufficient number of 
Ascaris larvae from the caecum of the mouse since if large doses of eggs 
are given to the mouse the animal dies before the 9th day, while if 
small doses are given only very small numbers of larvae are found in 
the caecum. 
Expt. 10. Sucking-pig No. 1. On 28. I. 17, when 4 weeks old, its faeces were 
examined and no Ascaris eggs found. The caeca of 4 mice, on the 10th day after 
infection, were given to the pig; the mice were known to be infected. On 11. n. 
the pig was killed, 12 Ascaris were found in its intestine, 2 large, most anterior (a A 
124 mm., a $ 183 mm.), 10 smaller worms further back measuring 73, 70, 65, 64 (2), 
63, 60, 47, and two cSo 61 and 55 mm. respectively. 
Expt. 11. Sucking-pig No. 2. On 28. I., when 6 weeks old, it showed no eggs 
in the faeces. The caeca of three mice on 10th day after infection were given. On 
11. n. the pig was killed, and no Ascaris were found present. 
Expt. 12. Control on Expt. 10. Sucking-pig from same farrow as Pig 1. It 
was killed and no Ascaris found. 
Expt. 13. Control on Expt. 11. Sucking-pig from same farrow as Pig 2. On 
15. ii. it was killed and 12 Ascaris measuring 207-119 mm. were found. This detracts 
from the importance of Expt. 10. 
Experiments to obtain Ascaris Larvae in the 
Caecum of the Mouse. 
The difficulty alluded to above must be borne in mind. 
A series of 46 mice was employed. Of these (A) four were examined 
without treatment. No forms resembling Ascaris larvae being found. 
( B ) Ripe Ascaris eggs were administered to 42 mice with the 
following results: sixteen died before the date of examination with the 
usual symptoms of acute Ascariasis; six were not examined, the organs 
being given unopened to pigs; six were not examined from other 
reasons. 
1 Previously recorded in Brit. Med. Journ. 1. vn. 1916, and Parasitology, ix. 155. 
