. The cat; an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. CHAP, viii.] OEGANS OF EESPIEATION AND SECEETION. 249 blood-vessels, and some muscular fibres. It lias an outer epithelial covering, and contains embedded vesicles of various sizes—called Graafian foUldes—containing the ova, or true female sexual product. In the stroma of the ovary there is but little fibrous connective tissue. It is made up mainly of large spindle-shaped cells,* which surround the Graafian follicles, being arranged concentrically about them. Upon dividing the ovary, v
. The cat; an introduction to the study of backboned animals, especially mammals. Cats; Anatomy, Comparative. CHAP, viii.] OEGANS OF EESPIEATION AND SECEETION. 249 blood-vessels, and some muscular fibres. It lias an outer epithelial covering, and contains embedded vesicles of various sizes—called Graafian foUldes—containing the ova, or true female sexual product. In the stroma of the ovary there is but little fibrous connective tissue. It is made up mainly of large spindle-shaped cells,* which surround the Graafian follicles, being arranged concentrically about them. Upon dividing the ovary, vesicles of various sizes are seen within,. Fig. 119.—Portion of the Section of thk prepared Cat's Ovary, represented in the PRECEDING FKiDRE, .MORE HIGHLY MAGNIFIED. 1. Outer covering of the ovaiy. 2. Fibrous stroma. 3. Superficial layer of fibro-uuclear substance. 3'. Deeper parts of the same. 4. Blood-vessels .5. Ovigerms forming a layer near the surface. 0. One or two of the ovigenns sinking deeper, and lieginniug to enlarge. 7. One of the ovigerms fuitlier ileveloped, now euch)sed by a i)rolongation of tlie fibrous stroma, and consisting of a small Graaliaii follicle, within which is situated the oxmn covered liy the cells of the tliscus proligerus. 8. A follicle further advanced. S'. Another which is irregularly compressed. 9. The greater part of the largest foUicle—iii which tlie following parts are seen: o, cells of tlie membrana granulosa lining the follicle; h, the reflected iJortion, named iliscus pjroligerus ; c, vitellus or yelk jiart of tlie oviun, surrounded by the zona pellucida ; d, germinal vesicle ; c, germinal spot. and these are much more numerous in the very young animal than in the adult. These vesicles, or " Graafian foUiclcs,^' are naturally spherical or oval, and have three coats. The first and most external of these, the tunic of tlie ovisac, or tunica fibrosa, is a fibrous, vascular membrane, containing oval nuclei, but destitute of oil g
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