The evolution of man: a popular exposition of the principal points of human ontogeny and phylogenyFrom the German of Ernst Haeckel . Fig. 294. Fig. 293.—Nerve-mnscle tissue. Three cells fi-om Hydra : n, onterjnervous ; m, inner, muscular part of the cells. (After Kleinenberg.^ Fig. 294.—Nerve-tissue (from a spinal nerve knot) : a, anterior, b,posterior root of the spinal nerve ; d, e, fibrous nerve-stem ; /, g, h, i, nervecells in ganglion (/, unipolar, g, h, bipolar cells); k, I, nerve fibres. (AfterFrev.) Fig. 295.—Muscle-tissue. Three pieces of striped muscle fibre (a). In-terfibrous fat-ce
The evolution of man: a popular exposition of the principal points of human ontogeny and phylogenyFrom the German of Ernst Haeckel . Fig. 294. Fig. 293.—Nerve-mnscle tissue. Three cells fi-om Hydra : n, onterjnervous ; m, inner, muscular part of the cells. (After Kleinenberg.^ Fig. 294.—Nerve-tissue (from a spinal nerve knot) : a, anterior, b,posterior root of the spinal nerve ; d, e, fibrous nerve-stem ; /, g, h, i, nervecells in ganglion (/, unipolar, g, h, bipolar cells); k, I, nerve fibres. (AfterFrev.) Fig. 295.—Muscle-tissue. Three pieces of striped muscle fibre (a). In-terfibrous fat-cells (h). (After Frej.) For while in the lowest Plant Animals the body consistsmerely of covering tissue, and while in many other TISSUES. 365 Zoophytes a middle layer of connective tissue developsbetween the two primary germ-layers, it is only in themost highly developed Plant Animals that muscle and nervetissue is formed. As has already been said, the latter firstappeared as a common nerve and muscle tissue (neuro-musculum, Fig. 293 ; cf p. 358). It was only afterwardsthat the muscle-tissue (Fig. 295) separated from the
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