and the whole world was ransacked merely to consign its living tenants
to the _vivaria_, and thence to the fatal arena of the amphitheatre. Yet
even here the naturalist might have pursued his studies on individuals,
and even whole species, both living and dead, without quitting Rome. The
animal kingdom lay tributary at his feet, but served only to satiate his
appetite or his passions, and not to enrich his mind.

So, again, Rome's armies traversed the globe, and her legions were often
explorers of hitherto unknown regions. But no men of science, no corps
of _savans_ was attached to her cohorts, to march in the footsteps
of conquest and gather the fruits of victory to enrich the schools.
Provinces were devastated, great cities plundered, nations made captive,
and all the masterpieces of Art borne off to adorn Rome. But Nature was
never rifled of her secrets; nor was discovery carried beyond the most
material things. The military spirit stifled natural science.

There were then, to be sure, no tendencies of thought to anything but
war, pleasure, literature, or art. There was comparatively no knowledge
of the physical sciences, whose culture Mr. Buckle has shown to have
exerted so powerful an influence on civilization. The convex lens--as
since developed into the microscope, the giver of a new world to
man--was known to Archimedes only as an instrument to burn the enemy's
fleet.

* * * * *

Modern pisciculture in some measure imitates, although, it does not
rival the ancient. Many methods have been devised in France and England
of breeding and nurturing the salmon, the trout, and other valuable
fish, which are annually becoming more scarce in all civilized