. Studies in horse breeding [microform] : an illustrated treatise on the science and practice of horse breeding. Chevaux; Horses; Horses; Chevaux. 24 STLDIKS I IIORSK BRKF.DINT, may safely assume that notliing is ever created. All things fall- ing under our observation are the result of some i)rocess of development. Spermatozoa are nf) excejition to this rule. They are developed from a very simple elemental cell, and require nourishment for their develojjment as well as does the fetus after fertilization, (jr tlie foal after birth. 43. The Development of Spermatozoa. I'.rief mention has al- r

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. Studies in horse breeding [microform] : an illustrated treatise on the science and practice of horse breeding. Chevaux; Horses; Horses; Chevaux. 24 STLDIKS I IIORSK BRKF.DINT, may safely assume that notliing is ever created. All things fall- ing under our observation are the result of some i)rocess of development. Spermatozoa are nf) excejition to this rule. They are developed from a very simple elemental cell, and require nourishment for their develojjment as well as does the fetus after fertilization, (jr tlie foal after birth. 43. The Development of Spermatozoa. I'.rief mention has al- ready been made (11 ) ( I'J) of this subject, but before we can pro- ceed with the sul)ject of fertilization, it will be necessary to observe more cl(»sely all tlie processes of development leadinir iu> to fertilization. '. FiKure 17.—. iiialure egg of the mare-a. egg nucleus, tilization. ready tor fer- Ihe sexual firgans of the stallion which are concerned in the development of spermatozoa are the testicles, vasa efferentia epididymus, vasa deferentia and vcsiculae seminales. The testicle is enclosed with a fibrous capsule, the tunica albuginea. This fibrous tissue is extended into the substance of the testicle, dividing the organ into sejiarate lobules. In each lobule are found many seminal tubules, commencing in a highlv convoluted portion, but ending in a straight tube, which pierces the tunica albuginea at the anterior extremitv of the testicle T hese seminal tubules are made up of several livers of cells the spermatoblast cells, and it is here that spermatozoa have their origin. Reference to this (, ^, nas already beet. made, but I icpt-at this part because of its importance to this subject. Hut here one finds only an elemental cell, capable of rotarv motion only, such as one observes in most vegetable cells. The e nucleus (j f thi s ce 11. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - col