F. H. Stewart 
203 
As to the effect of the disease on the individual animal I would note 
the following: of the above 83 animals 44 were classed as doing well, 
39 as doing badly. In the former group 11*3 % were infected, in the 
latter 33-3 %. 
Pulmonary Ascariasis in pigs: I am informed on good authority 
that pneumonia is a common disease of young pigs and that a pig 
which has suffered from pneumonia is considered unthrifty and 
slaughtered forthwith to save waste in feeding. A certain number of 
these cases may be due to Ascariasis. 
The loss of valuable food material through Ascariasis in pigs may 
therefore be considerable and of great importance at times of food 
scarcity such as the present. 
Importance of Ascariasis in Man. 
Pulmonary Ascariasis in Man. It may be doubted whether under 
natural conditions man would ever receive a sufficiently large dose of 
eggs to cause serious pulmonary symptoms in a healthy person. The 
injury caused to the lung by the passage of the larvae might readily 
be the starting point of bronchopneumonia in a weakly child. The 
passage of the larvae may also be the cause of many of those irregular 
febrile attacks which are common in children in districts in which 
Ascaris is common. 
The cosmopolitan distribution, great prevalence and debilitating 
results of intestinal Ascariasis are old-established facts. It may be 
doubted, however, whether the importance of the disease in state 
medicine is sufficiently recognised. There is reason to suppose that 
a great deal of the debility of the natives of the tropics is due to Ascariasis 
and that this disease is at least equal to Anklylostomiasis in economic 
importance. 
Development of the eggs of Ascaris lumbricoides 
in various Media 1 . 
(1) In Human Faeces. 
Development of the eggs, up to an advanced stage of segmentation 
can take place in human faeces when freely exposed to the air (Expts. 
1 and 2 v. infra), but it is considerably slower and more irregular than 
in damp air. On the third day after evacuation, the eggs are still 
1 I regret being unable to refer to the recent literature of this subject, therefore I 
cannot ascertain if similar observations have already been made or not. 
