href="@public@vhost@g@gutenberg@html@files@48010@[email protected]#Fig_62" class="pginternal" tag="{http://www.w3.org/1999/xhtml}a">62.

Ditto, more highly magnified 230 63. Tetrarhynchus appendiculatus from the Plaice 230 64. Hook of Linguatula 232 65. Linguatula, showing Hooks 232 66. Strongylus gigas, female 239 67. Ascaris lumbricoides; also Head, Tail, and Body 240 68. Trichocephalus from Man 241 69. Oxyuris vermicularis, natural size and magnified 241

70. Trichina, free 243 71. Trichina encysted in Muscle 243 72. Echinorhynchus proteus 252 73. Sac with Psorospermiæ from Sepia officinalis 252 74. Gregarinæ from Nemertes Gesseriensis 253 75. Stylorhynchus oligacanthus 253 76. Dicyema Krohnii from Sepia officinalis 254 77. Stylops 256 78. Ditto, with Embryos 257 79. Larva of Black Stylops 257 80. Cochineal Insects, male 263 81. Ditto, female 264 82. Aphis 264 83. Rose Aphis, male and female 265

INTRODUCTION.

“The edifice of the world is only sustained by the impulses of hunger and love.”—Schiller.

In that great drama which we call Nature, each animal plays its especial part, and He who has adjusted and regulated everything in its due order and proportion, watches with as much care over the preservation of the most repulsive insect, as over the young brood of the most brilliant bird. Each, as it comes into the world, thoroughly knows its part, and plays it the better because it is more free to obey the dictates of its instinct. There presides over this great drama of life a law as harmonious as that which regulates the movements of the heavenly bodies; and if death carries off from the scene every hour myriads of living creatures, each hour life causes new legions to rise up in order to replace them. It is a whirlwind of being, a chain without end.

This is now more fully known; whatever the animal may be, whether that which occupies the highest or the lowest place in the scale of creation, it consumes water and carbon, and albumen sustains its vital force.

Therefore, the Hand which has brought the world out of chaos, has varied the nature of this food; it has proportioned this universal nourishment to the necessities and the peculiar organization of the various species which have to derive from it the power of motion and the continuance of their lives.

The study whose aim is to make us acquainted with the kind of food adapted to each animal constitutes an interesting branch of Natural History. The bill of fare of every animal is written beforehand in indelible characters on each specific type; and these characters are less difficult for the naturalist to decipher than are palimpsests for the archæologist.

Under the form of bones or scales, of feathers or shells, they show themselves in the digestive organs. It is by paying, not domiciliary, but stomachic visits, that we must be initiated into the details