Petavius, the learned Jesuit, when composing his "Theologica
Dogmata" and other works, would leave his table and pen at the end
of every other hour to twirl his chair, first with one hand, then with
the other, for ten minutes, by way of exercise. Cardinal Richelieu
resorted to jumping in his garden, and in bad weather leaped over
the chairs and tables indoors,—an exercise which seemed to have a
special charm for him. Samuel Clark, the English philosopher and
mathematician, adopted Richelieu's plan of exercise when tired of
continuous writing. Pope says, with regard to exercise, "I, like a poor
squirrel, am continually in motion, indeed, but it is only a cage of
three feet: my little excursions are like those of a shopkeeper, who
walks every day a mile or two before his own door, but minds his
business all the while."
We are told that Douglas Jerrold, when engaged in preparing literary
matter, used to walk back and forth before his desk, talking wildly to
himself, occasionally stopping to note down his thoughts. Sometimes
he would burst forth in boisterous laughter when he hit upon a droll
idea. He was always extremely restless, would pass out of the house
into the garden and stroll about, carelessly picking leaves from the
trees and chewing them; then suddenly hastening back to his desk,
he recorded any thoughts or sentences which had formed
themselves in his mind. Jerrold wrote so fine a hand, forming his
letters so minutely, that his manuscript was hardly legible to those
not accustomed to it. He was very fastidious about his writing-desk,
permitting nothing upon it except pen, ink, and paper. Like most
persons who habitually resort to stimulants, he could not be content
with a single glass of spirits or wine, but consumed many, until he
was only too often unfitted for mental labor. Jerrold's wit was of a
coarser texture than that of Sheridan, but, unlike his, it came with
spontaneous force; it was always ready, though it had not the polish
which premeditation is able to impart. Oftentimes his wit was
severely sarcastic, but as a rule it was only genial and mirth-
provoking.