. Principes de la zoologie : toucher la structure, le développement, la distribution, et l'arrangement naturel des races d'animaux, vivant et éteint avec de nombreuses illustrations : partie 1, physiologie comparative : pour l'utilisation des écoles et des collèges. Tissus il y a beaucoup plus de difficulté. Leurs variations sont si grandes, et leurs transformations si diverses, qu'après la période embryonnaire il est parfois impossible, même par le plus proche examen-ination, de détecter leur structure cellulaire originale. 40. Plusieurs types de tissus ont été désignés dans la structure animale, mais leurs différences ne sont pas alwa

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. Principles of zoölogy : touching the structure, development, distribution, and natural arrangement of the races of animals, living and extinct with numerous illustrations : Part 1, Comparative physiology : for the use of schools and colleges. tissues there isfar greater difficulty. Their variations are so great, andtheir transformations so diverse, that after the embryonicperiod it is sometimes impossible, even by the closest exam-ination, to detect their original cellular structure. 40. Several kinds of tissues have been designated in theanimal structure ; but their differences are not always wellmarked, and they pass into each other by insensible shades.Their modifications are still the subject of investigation, andwe refer only to the most important distinctions. 41. The cireolar tissue consists of a network of delicatefibres, intricately interwoven so as to leave numberlesscommunicating interstices, filled with fluid. It is inter-posed in layers of various thickness, between all parts ofthe body, and frequently accompanied by clusters of fatcells. The fi^^ous and the serous membranes are mere•nodifications of this tissue. 42 The cartilaginous tissue is composed of rucleated ELEMENTARY STRUCTURE OF L.IGANIZED BODIES.. cells, the intercellular spaces being filled with a more com-pact substance, called the hyaline matter. Figure 4 repre-sents a slip of cartilage from the horse, undera magnifying power of one hundred and twen-ty diameters. 43. The osseous or boni/ tissue differs fromthe cartilaginous tissue, in having its meshesfilled with salts of lime, instead of hyaline sub-stance, whence its compact and solid appear-ance. It contains, besides, minute, rounded, or star-like points, improperly called bone-corpuscles, which are found to be cavities orcanals, sometimes radiated and branched, asis seen in figure 5, representing a section of abone of a horse, magnified four hundred times, 44. The muscular tissue^ which forms the flesh of ani-mals, is composed of b

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