from a metal whistle, which was repeatedly sounded near them; nor did they of the deepest and loudest tones of a bassoon." But it is always necessary to discriminate between sound and vibrations passing through any solid body, which would appeal rather to a sense of touch. Here worms are most sensitive. It is quite easy, by digging with some vigour, to arouse the worms in the neighbourhood, who will crawl to the surface and away from the scene of action; a proceeding on their part which is sometimes put down to a desire to escape from their enemy the mole. Smell appears to be another sense which is somewhat deficient. {355}But worms are epicures, and exhibit a decided taste and preference for certain articles of diet. Like their fellow tiller of the soil, the agricultural labourer, worms have a keen relish for onions, which, however, they must recognise by the smell. They prefer green cabbage to red, celery to both, and raw meat appears to be the greatest delicacy that can be offered to them. It is only substances they are not likely to meet with, such as perfumes, tobacco, and paraffin, that produce no impression upon the worm's sense of smell. COELOM AND VASCULAR SYSTEM.—When an earthworm is dissected the various organs are seen to lie in a fairly spacious cavity, which is interrupted and divided into a series of chambers by the mesenteries or septa which stretch across from wall to wall of the body, and correspond roughly in their position to the grooves which separate the body externally. This cavity, common to all the higher animals, is known as the coelom; it is lined by cells, which cover the intestines as well as the inside of the body-wall; and upon the intestine assume the form so characteristic of the group, namely, that of large yellow cells loaded with secreted matters, and called "chloragogen-cells" by Claparède. The coelom communicates with the exterior by means of the dorsal pores, the nephridia, and the ducts of the reproductive organs. As in all animals which possess a coelom, the reproductive tissues, ova and sperm, are developed on its walls. [Illustration: FIG. 190.—_Sparganophilus tamesis_; general anatomy, × 3. (After Benham.) I-XVIII, segments. 1, 4, 6, Perivisceral vessels (6 is one of the hearts); 2, 3, 7, dorsal vessel; 5, spermatheca; 8, sperm sacs; 9, intestino-tegumentary vessels; 10, ovary; 11, 12, integumentary vessels.]