Through lenses nicely fitted to holes cut in the chests of live dogs, scholars at the University of Maryland, are now able to watch directly hearts in action, it was revealed at Baltimore last week. Such direct observation is all-important because it reveals heart conditions in health and disease which X-rays, diagnostic machines (such as described at Washington last week; see p. 36), and physical symptoms cannot disclose.
Veterinarians at Pennsylvania State College a year and a half ago plugged Jessie, their experimental heifer, similarly (they cut into the first of her four stomachs) to watch for the formation of Vitamin...
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