No More Learning

I know not how significant it is, or how far it is an evidence of
singularity, that an individual should thus consent in his pettiest
walk with the general           of the race; but I know that something
akin to the migratory instinct in birds and quadrupeds,--which, in
some instances, is known to have affected the squirrel tribe,
impelling them to a general and mysterious movement, in which they
were seen, say some, crossing the broadest rivers, each on its
particular chip, with its tail raised for a sail, and bridging
narrower streams with their dead,--that something like the _furor_
which affects the domestic cattle in the spring, and which is referred
to a worm in their tails, affects both nations and individuals, either
perennially or from time to time.