Tortoises seem, by their thick shells, to be protected against all changes of the weather. But one of immense size, imported from the Galapagos Islands to England, was actually afraid of rain. Its owner says: "No part of its behaviour ever struck me more than the extreme timidity it always expresses with regard to rain; and though it has a shell that would secure it against a loaded cart, yet it exhibits as much solicitude about rain as a lady dressed in her best attire, shuffling away on the first sprinklings and running its head into a corner. If attended to, it becomes an excellent weather glass; for as sure as it walks elate, and as it were on tip-toe, feeding with great earnestness in the morning, so sure will it rain before night." The same tortoise was careful to keep out of the hot sun, and always sought a shady nook at mid-day in summer. _Pea Crabs._ The fact that these small crabs take up their abode within the shells of mollusks was well known to the ancients, and gave rise to many curious fables. A species is very common in the _pinnæ_ (mollusks) of the Mediterranean, and was imagined to render important services to its host in return for its lodging, keeping a lookout for approaching dangers, against which the blind pinna itself could not guard, and particularly apprising it, that it might close its shell when the cuttle-fish came near. It is curious to find this repeated by Hasselquist, in the middle of the last century, as a piece of genuine natural history. Whether the pea crab lives at the expense of the mollusk, and sucks its juices, is uncertain. It is certain, however, that the flesh of such mollusks is palatable to pea crabs, as they eat it greedily in the aquarium. _Extraordinary Muscular Strength of the Bat._ When bats bring forth their young they are obliged to carry them on their backs, as they do not build nests like the birds, the little things hanging fast to their fur during flight. The extrordinary strength of muscle possessed by the bat is shown in the fact that two of the young, which are often born at a birth, weigh two-thirds as much as the parent. Thus, flying at nearly double its ordinary weight, we can fancy the power of this animal, surpassing in proportion the strength of the eagle or condor. _Great Digestive Powers._ In certain caterpillars the digestive power is so great that they swallow every day three or four times their own weight in food. If the elephant and rhinoceros were to feed on this scale, and were as numerous as the caterpillars, they would require but a short time to devour all the vegetation on the globe. _The Earwig._