. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. AREOLAR OR CONNECTIVE TISSUE. 335 physiologists it is believed that both yellow and whitefibrous tissue arise from cells. Areolar or connect-ive tissue, Fig. 127, iscomposed of the twopreceding elements, theyellow and white fi-brous, interwoven witheach other so as to con-stitute a porous struc-ture, with a multitudeof intercommunicatingspaces. It is to be un-derstood that these in-terstices are wholly dis-tinct from cells; hencethe inapplicability ofthe term
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. AREOLAR OR CONNECTIVE TISSUE. 335 physiologists it is believed that both yellow and whitefibrous tissue arise from cells. Areolar or connect-ive tissue, Fig. 127, iscomposed of the twopreceding elements, theyellow and white fi-brous, interwoven witheach other so as to con-stitute a porous struc-ture, with a multitudeof intercommunicatingspaces. It is to be un-derstood that these in-terstices are wholly dis-tinct from cells; hencethe inapplicability ofthe term cellular, some-times employed for thistissue. Areolar tissue is employed for uniting the va-rious animal parts. Its interspaces are filled with afluid, which, when in excess, is spoken of as dropsicaleffusion. Air, artificially or accidentally introduced atany point into it, may pass to every part, as is illustratedin cases of emphysema. The specimen from which thefigure is taken was in this manner inflated. What is areolar tissue ? In what respect does it differ from cel-lular tissue ?. Areolar tissue, magnified 25 diameters. 336 THE SPERH-CELL. CHAPTER XXIII. OF REPRODUCTION AND DEVELOPMENT. Reproduction: Conjugation.—The Sperm-cell: its Pro-duction.—Spermatozoa.—The Germ-cell: its Produc-tion. Ovum in the Ovary.—Its Structure.— Corpus Luteum. Ovum in the Oviduct.—Mulberry Mass.— GerminalMembrane.—The Chorion. Ovum in the Uterus.—Membrana Decidua.—Placenta.—Development of the Embryo.—Law of Yon Bar.— Types of Nutrition.— Of Conception.— Of Gesta-tion.— Of Parturition.—Influence of both Parents. In reproduction of the higher type two cells are nec-essary. These, differing in construction and also in func-tion, are designated the sperm-cell and germ-cell re-spectively. 1st. Of the Sperm-cell.—The testes are the organs inwhich the sperm-cells arise in man. They are of anovoid form; each is covered with a white envelope, thetunica albuginea. A
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