Anonyme, « Economy of the Earth », The Dublin Review, vol. 1, mai 1836, p. 5.

It is the same with the caddis-worm, which we have just mentioned. It its habitation be too heavy, it buoys up the mansion by the addition of some lighter material; if the abode be in danger of floating about at the mercy of the current, the peril of shipwreck is foreseen and prevented by increasing the ballast. Here are foresight, calculation, mechanical adjustment, all contained in a creature not larger than a pin ! If these attributes be called instinct, we shall not quarrel with the phrase; but we submit that there is a marvellous resemblance between such instinct and that general faculty to which men have agreed to give the name of reason.