Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . the waste particles are carried out ofthe system. The fluids and solids, being alternately converted into each other, do not differ essentially in theirchemical elements. 25. The human body has been found, by chemicalanalysis, to contain the following elementary substances:Oxygen, hydrogen, nitrogen, carbon, sulphur, phosphorus,silicon, chlorine, fluorine, iron, and sometimes mangane-sium, aluminum, and
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . the waste particles are carried out ofthe system. The fluids and solids, being alternately converted into each other, do not differ essentially in theirchemical elements. 25. The human body has been found, by chemicalanalysis, to contain the following elementary substances:Oxygen, hydrogen, nitrogen, carbon, sulphur, phosphorus,silicon, chlorine, fluorine, iron, and sometimes mangane-sium, aluminum, and copper. 26. The first four are most constant and most abundant,and are named essential elements. 27. The solid portions of the body are called tissues. How are the substances which compose animal bodies divided ? How manypounds of fluid may be drawn from the body of a man weighing one hundredand fifty pounds? How can the weight of the body be farther reduced?When are the fluids most abundant and when least abundant? How manyelementary substances are there in the human body? Which are the fouiessential elements? What are the solid portions of the body called? 20 CLASS-BOOK OF PHYSIOLOGY. Fig. 1.—Parent Cells.—a, a, Parent ), b, Secondary , c, Nuclei. 28. The tissues, in their primary formations, are madeup of granules, nuclei, cells, filaments, and fibres. 29. Granules are particles of various sizes, from immea-surable minuteness to the ten-thousandth of an inch indiameter. Granules are found floating in milk, chyle, andother animal fluids, and imbedded in most of the tissues. 30. Nuclei are the germ and cen-tre around which cells are formed.{Fig. 1.) 31. Cells are minute bubbles, vesi-cles or scales. Their natural shapeis oval or sphereda]. but they oftenbecome flattened or many-sided bypressure, as may be illustrated byfilling a vial with a strong solutionof soap in water, and then invertingit, when it will be filled with bubbles, each one of which will assu
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