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Many insects pass the winter in the quiescent or pupal stage; a state exceedingly well fitted for hibernating, requiring as it does, no food, and giving plenty of time for the marvellous changes which are then undergone. Some of these pupae are enclosed in dense silken cocoons, which are bound to the twigs of the plants upon which the larvae feed, and thus they swing securely in their silken hammocks through all the storms of winter. Perhaps the most common of these is that of the brown Cecropian moth, _Attacus cecropia_ L., the large oval cocoon of which is a conspicuous object in the winter on the twigs of our common shade and fruit trees. Many other pupae may be found beneath logs or on the under side of bark, and usually have the chrysalis surrounded by a thin covering of hairs, which are rather loosely arranged. A number pass the cold season in the earth with no protective covering whatever. Among these is a large brown chrysalis with a long tongue case bent over so as to resemble the handle of a jug. Every farm boy has ploughed or spaded it up in the spring, and is it but the pupa of a large sphinx moth, _Protoparce celeus_ Hub., the larva of which is the great green worm, with a "horn on its tail," so common on tomato plants in the late summer.

It was rather interesting to note that the formation of the right bank was exactly the same as that of the Paredao Grande we had seen in Matto Grosso. Vertical sides in great rectangles were noticeable, intersected by passages--regular canons--where small huts could be seen at the foot of the picturesque rocks, especially at places where small streamlets entered the Tapajoz. I was told that little lakes had formed beyond those frontal rocky masses, the entrances to which were blocked at low water by sand-bars. Beyond that row of vertical red rocks was a more or less confused mass of hills, some dome-like, others of a more elongated form, but still with a well-rounded sky-line. The water of the stream had now changed colour altogether, and had become of a deep green. Islets could be seen far, far away to the left side of the river, mere white dots and lines along the water-line, most of them having white sand-beaches around them; while on the right bank the great red walls in sections continued for many miles. As we neared the mouth of the Tapajoz, the river had the immense width of 14 kil. On the right, after going through the Passagem dos Surucue, we passed the mountain of Jaguarary, which stood prominent along a flat elevation on the right bank.

Almost never do we find a device in nature which occurs once only. The unique hardly exists: nature is a great copyist. At least two animals of wholly unlike kinds are all but sure to hit independently upon the self-same mechanism. So it is not surprising to learn that a cat-fish has invented an exactly similar mode of carrying its young to that adopted by the Surinam toad: only, here it is on the under surface, not the upper one, that the spawn is plastered. The eggs of this cat-fish, whose scientific name is Aspredo, are pressed into the skin below the body, and so borne about by the mother till they hatch. This is the second instance of which I spoke above, where the female fish herself assumes the care of her offspring, instead of leaving it entirely to her excellent partner.

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