The people's common sense medical adviser in plain English, or, Medicine simplified . speak of the effects of mind or body, separately, but wemay consider their action and reaction upon each other, forthey are always associated. There are many difliculties attend-ing this relationship, some of which may be ob^iated byconsidering the development of nei-vous matter and its functionsin the lower orders of organization. 150. Within the plant-cells is found a vital, vegetable sub-stance termed protoplasm, which exerts the same nutritive poweras the tissues of the polyp and jelly fish. Many families
The people's common sense medical adviser in plain English, or, Medicine simplified . speak of the effects of mind or body, separately, but wemay consider their action and reaction upon each other, forthey are always associated. There are many difliculties attend-ing this relationship, some of which may be ob^iated byconsidering the development of nei-vous matter and its functionsin the lower orders of organization. 150. Within the plant-cells is found a vital, vegetable sub-stance termed protoplasm, which exerts the same nutritive poweras the tissues of the polyp and jelly fish. Many families ofanimals present an appearance of pulp, have slight instinctivemotion and sensibility, and accoiding as the nervous system isdeveloped, both of these powers are unfolded. Plants have a lowdegree of sensibility, limited motion, respii-atory and cu-culatoryorgans. Animals possess quicker perceptions and sensibilities,the power of voluntary motion, and likewise a rudimental nervoussystem. Some articulates have no skeleton, their muscles being 110 CERKBUAL PHYSlOLOtJY. Ill Fig. attached to the skin which constitutes a soft contracting of tlie simplest forms of animal life in which a nervous systemis found,is the tive-rayed star-tish. In lach ray or arm there are filaments which connect with sim-ilar nerves, and form a circlearound the digestive cavity. Itprobably has no conscious per-ception and its movements donot necessarily indicate sensa-tion or volition. In some wormsa rudimentary nervous system issparingly distributed to the cavi-ties of the thorax and abdomen,and, as in the star-fish, the largestnerve-tilament is found aroundthe esophagus, presiding like agoddess over A higher grade of organization requires a more completearrangement of nei\ous substance. Stimulus apj^lied to oneorgan is readily communicated to, and excites activity in another. The nervous system ofsome insects consists of two,long, white cords, whichrun longitudinally thro
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Keywords: ., bookcentury180, bookdecade1870, booksubjectmedicine, bookyear1876
