The shell-fish should be placed in alcohol. The outer shell, when it is spiral, should be broken at the upper part, and at several points of the spire, to let the liquor run in, so that the whole animal may be preserved; it is possible, following this indication, to have shell-fish in such order, that they may be dissected, even after being a very long time in the collections. In calm or gentle breezes, it is well to have ready a gauze net to seize the sea molluscs, whose number is considerable. They should be watched and drawn several times a night, for it is probable that the spirule will be found at the surface of the water. Fishes should be opened to find this same spirule which is doubtless caught by them; the other Cephalopodes are not less numerous or less curious to study. There is a class of being called marine worms or Annelides, of which but a few kinds are known, because little pains have been taken to collect them; these animals frequent generally the shores of the sea, a great number live in the interstices of madrepores, several make deep holes in the sand or in the mud. With spades and hammers they could be easily procured; it would be necessary to preserve them in alcohol, as the greatest part of these kinds make themselves sheaths, it would be well to collect them and put them in spirits of wine. Ordinarily these animals quickly change color; it would be well to note their color; it would be always well to do this for the leeches, whose colors disappear as soon as they are dead. The attention of naturalists should be directed towards the lombrics or earth-worms. These animals could be sent us alive as well as all the land molluscs, by sending them in closed boxes containing a little earth or damp moss. It would be well to look for the entozoaires or helminthes of different animals and send them, declaring at the same time the animal and viscera whence the worm is extracted.