. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. FHYSIOLOG Y. 1 5 When an organic substance, which is so constructed as to form part of a living organism, is examined, it is found to possess some very distinctive characters. It contains water in considerable pro- portion ; its form is more or less rounded, and free from angularity, and it is never crystallized. When it is necessary that it should possess considerable hardness, the amount of water is small, and an i
. An analytical compendium of the various branches of medical science, for the use and examination of students. Anatomy; Physiology; Surgery; Obstetrics; Medicine; Materia Medica. FHYSIOLOG Y. 1 5 When an organic substance, which is so constructed as to form part of a living organism, is examined, it is found to possess some very distinctive characters. It contains water in considerable pro- portion ; its form is more or less rounded, and free from angularity, and it is never crystallized. When it is necessary that it should possess considerable hardness, the amount of water is small, and an inorganic material is combined with the organic matter, as the phos- phate of lime with gelatine in bones, or the silex with the epidermic tissues, in plants. An organized body is composed of parts which differ from each other in structure and function ; it may be subdivided into a series of textures, each differing from the others in physical and vital pro- perties. When a great variety of textures exist in an animal, it is an indication of a high degree of organization. The simplest and most elementary organic form, is that of a cell containing another within it, [nucleus,) which again contains a gr^- nularbody,(?zZ('c/eoZw5.)(Fig. 1.) This appears to be the primary form which organic matter Fig. 1. takes as it passes from the condition of a proxi- mate principle to that ofan organized structure. In some animals and vegetables, the whole body is composed of cells of this kind, and in the development of the embryo, all the tis- sues, however dissimilar, are composed of cells which are afterwards metamorphosed into- the various structures that make up the perfect being. Every organized body has a definite form and size; it has also its origin from parents, and has an allotted time to live ; and after death it passes by decomposition into the simpler combinations of the inorganic elements. Organized bodies grow by materials which are deposited within, and carried to the different
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