General principles of zoology . s is a body enclosed in the protoplasm,whose form, though definite for each kind of cell, shows respects wide variations. Usually it is a spherical oroval vesicle; but it may be elongated or club-shaped,bent into a horseshoe, with constrictions like a rosary, oreven be branched, treelike (Fig. 18); in many cells it isdisproportionally large, so that the protoplasm surroundsit only with a thin layer, in others again it is so small thatit can scarcely be found in the protoplasm and surrounding GENERA L ANA TOM Y. substances. Formerly, on this account, it
General principles of zoology . s is a body enclosed in the protoplasm,whose form, though definite for each kind of cell, shows respects wide variations. Usually it is a spherical oroval vesicle; but it may be elongated or club-shaped,bent into a horseshoe, with constrictions like a rosary, oreven be branched, treelike (Fig. 18); in many cells it isdisproportionally large, so that the protoplasm surroundsit only with a thin layer, in others again it is so small thatit can scarcely be found in the protoplasm and surrounding GENERA L ANA TOM Y. substances. Formerly, on this account, it was in very manycases overlooked, and, even yet, it can often be demon-strated only by the exercise of great care, and by employ-ment of a special technique based upon the peculiar reac-tion of the nuclear substance. The Nuclear Substance.—The nuclear substance isdistinguished from protoplasm among other ways by itsgreater coagulability in certain acids, , acetic andchromic acids, which therefore are often used for demon-.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
