. Human physiology : designed for colleges and the higher classes in schools, and for general reading. cells. These cells, which havea nucleus or central particle, are originally globular, but manyof them assume various shapes, and often shoot out of the shapes are very fantastic as represented in Fig. are magnified 200 diameters. 207. In the views which I have given of cell-life, I have notattempted to describe all the phenomena which have been dis-covered, but only enough of them to give the student a generalview of this interior unseen life, that is at work so busily
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. cells. These cells, which havea nucleus or central particle, are originally globular, but manyof them assume various shapes, and often shoot out of the shapes are very fantastic as represented in Fig. are magnified 200 diameters. 207. In the views which I have given of cell-life, I have notattempted to describe all the phenomena which have been dis-covered, but only enough of them to give the student a generalview of this interior unseen life, that is at work so busily atevery point of every living substance. The cell, you have seen,performs a great variety of functions. It is the agent by whichall vital operations are carried on. The very beginning of life,so far as we can see, is in the cell which the microscope revealsto us. Its first manifestation is here. We can suppose a germas the origin of a cell, but we do not see it if it exist. 208. All animated nature is built up by cells. The first CELL-LIFE. lWi All organized substances built up by cells. FIG. NERVE CELLS IN THE QUAY SUBSTANCE. thing which comes from the supposed germ is a cell. Andthis single cell is the parent of all the cells which build up thewhole structure, whatever it be. It is by these cells thus pro-duced, that all plants and animals are constructed. A globu-lar mass, says Carpenter, containing a large number of cellsis formed before any diversity of parts shows itself; and it isby the subsequent development, from this mass, of differentsets of cells, of which some are changed into cartilage, othersinto nerve, others into muscle, others into vessels, and so on,that the several parts of the body are ultimately formed. Ofthe cause of these transformations, and of the regularity withwhich they take place in the different parts, according to thetype or plan upon which the animal is constructed, we are en-tirely in the dark; and we may probably never know muchmore than
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