tions, notably in Denmark, where the method was first
reduced to a system under the able leadership of Professor Bang, of
Copenhagen, for ten years with scarcely a single case of tuberculosis
developing. Only a fraction of one per cent of calves from the most
diseased mothers are born diseased.

Not only is the method spreading rapidly among the more intelligent
class of breeders, but many progressive countries of Europe and states
of our Union require the passing of the tuberculin test as a requisite
to the admission within their borders of cattle intended for breeding
purposes. So that, while the problem is still an enormous one, it is now
confidently believed that complete eradication of bovine tuberculosis is
only a question of time.

The other instance furnishes a much more crucial test, as it is carried
out upon wild animals under the unfavorable conditions of captivity in a
strange climate, like our slum-dwellers from sunny Italy, and comes home
to us more closely in many respects, inasmuch as it is concerned with
our nearest animal relatives on the biological side--monkeys and apes,
in zooelogical gardens.

Tuberculosis is a perfectly frightful scourge to these unfortunate
captives, causing not infrequently thirty, fifty, and even sixty per
cent of the deaths. This, however, is only in keeping with their
frightful general mortality. The collection of monkeys in the London
Zoo, for instance, some fifteen years ago, was absolutely exterminated
by disease and started over afresh _every three years_, a death-rate of
thirty-five per cent per annum as compared with our human rate of about
two per cent per annum. Here, it would seem, was an instance where there
was little need to call in the bacillus. Brought from a tropical climate
to one of raw, damp fog and smoke, from the freedom of the air-roads
through the tree-tops to the confinement of dismal and often dirty cages
in a stuffy, overheated house, condemned to a diet which at best could
be but a feeble and far-distant imitation of their natural food, it
seemed little wonder that they "jes' natcherly pined away an' died."

But let the results speak. A thorough system of quarantine was enforced,
beginning with one of the Vienna gardens, and finally reaching one of
its most brilliant and successful exemplifications in our own New York
Zooelogical Gardens in the Bronx. All animals purchased or donated were
tested with tuberculin, and those that reacted were either