W. p. MCNULTY 
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lar or particularly pulmonary, physiologic ex- 
periments. There are disturbances in function, 
even though we don't clinically recognize them. 
Albert M. Jonas, Yale University School of 
Medicine, New Haven : Just a comment on the 
lesions of the pulmonary vessels that you're 
seeing. There is some danger obviously in re- 
lating these lesions to pulmonary hypertension. 
If we want to compare them to some of the 
lesions that we see in cats, in which the lesions 
of the pulmonary hypertrophy and hyperplasia 
can even be more florid than what you're seeing 
here, then these animals are hypertensive but 
many of them are not. If we say these monkeys 
have pulmonary hypertension, it might be just a 
little bit premature at this point. The other 
point I'd like to make is that if the Pneumonyssus 
is a very common parasite, then it's difficult to 
relate this in terms of causality to the lesion. It 
may in fact be related, but we have to be a 
little careful about that also. 
Dr. McNulty : I really hoped I was present- 
ing this paper to outline questions worthy of 
investigation rather than to provide answers. 
I agree with most of the things you said. The 
degree of arterial change, I think, has pretty 
clearly correlated with the extent of evidence of 
mite infestation. But other than this associative 
kind of evidence, we have none. There is no 
sure way to diagnose hypertension except to 
measure the pressure and this has not been 
done. 
