_Maternal and conjugal_ affection, however, are, as in man, so in animals, the two strongest forms of family attachment. A French author, M. Menault, has written a special treatise on _L’Amour Maternel chez les Animaux_, and Dr. Büchner exclaims, _à propos_: “If a human mother, with certain destruction staring in her face, dashes into a burning house to save her imperilled child, and thus finds her own death, this sacrifice is no greater, no more heroic, than that of a stork-mother who, after vain efforts to save her brood, is voluntarily burnt up with them in her nest; or of those elephant-mothers who, as Schweinfurth narrates, in the African hunting expeditions, when the bushes along the shore are ignited in order to drive out the elephants, seek to save their young ones by filling their trunks with water and sprinkling it over them, while they themselves are roasting.” How low down in the scale of animal life traces of _conjugal_ attachment are to be found is shown by the following case cited by Darwin: “An accurate observer, Mr. Lonsdale, informs me that he placed a pair of landsnails, one of which was weakly, into a small and ill-provided garden. After a short time the strong and healthy individual disappeared, and was traced by its track of slime over a wall into an adjoining well-stocked garden. Mr. Lonsdale concluded that it had deserted its sickly mate, but after an absence of twenty-four hours it returned, and apparently communicated the result of its successful exploration, for both then started along the same track and disappeared over the wall.” Again, the naturalist, Mr. Bate, experimented on the conjugal feelings of _Gammarus marinus_, or the sandskipper common on English shores, by separating a male from its female, and imprisoning both in the same vessel with many individuals of the same species. “The female, when thus divorced, soon joined the others. After a time the male was put again into the same vessel; and he then, after swimming about for a time, dashed into the crowd, and without any fighting at once took away his wife. This fact shows that in the Amphipoda, an order low in the scale, the males and females recognise each other, and are mutually attached.”