PROF. AGASS1Z, ; S 



take the ovary when forming and examine what is 

 produced. There we observe that the ovary consists 

 of pouches (Plate XXXVIII, figure A) folds of 

 [PLATE XXXVIIi. OVISAOS AND EGGS OF As- 



CIDIA.] 



membranes, in each of which bottle-shaped pouch- 

 es (fig. B ) there are masses of eggs and other sub* 

 tances granulated substances and complete eggs 

 in the larger ones. You may perhaps distinguish 

 from the distance that in such a pouch (fig. A.) 

 which is circumscribed by a membrane, there is a 

 mass of little granules and a number of eggs, each 

 having a vitelline membrane with its germinative 

 vesicle and its germinative dot. The smaller of 

 ihe.se pouches contain the same elements. These 

 smaller ones will contain fewer eggs. The still 

 smaller one will contain also eggs, but they are 

 not so v/ell defined. And we may find some pouch* 

 es in which there are no distinct eggs, but a bag 

 full of uniform, clear liquid. 



Here is the starting point. And if we examine 

 under a very high power what is going on in these 

 pouches, we may observe all the changes which are 

 represented (Plate XXXVII) in these various fig- 

 ures. First a little ba<? is observed, but perfectly 

 transparent and homogeneous. Others may grow 

 larger, but still contain transparent homogeneous 

 fluid. All these figures are represented under the 

 same magnifying power. Then we may find one 

 in which the membrane surrounding the liquid di- 

 vides. This process of dividing is observed in the 

 yolks when fully grown, giving rise to the embry- 

 onic cells; here it takes place to form numerous 



[PLATE XXXVII FORMATION OF GERMS.] 



eggs, giving first rise to two continuous vesicles, 

 one larger than the other, which may grow to an 

 equal or to an unequal size the one dilating, the 

 other growing less, may give rise to two'half vesi- 

 cles* Next, they may grow larger. Next, we ob- 

 serve that granules are formed. Here we have the 

 first element of heterogeneous substance. Granules 

 are formed within. How such changes are 

 brought about is not understood. It is a mystery 

 in the subject of our investigation. But that is 

 takes place can be easily seen. 



Now, these bags being full, no longer of a 

 uniform liquid, but of a granulated liquid, will un* 

 dergo the same change. They will divide into 

 two sacs, which will grow equally or will remain 

 unequal, and we shall have the process of separa s 

 tion as observed here. But as soon as granules 

 have become numerous, there is a condensation 

 taking place in some point. These granules ag 

 glomerate in some point ,without having a mem= 

 brane about them. There is simply a dense con- 

 densation of granules in one point. And this con- 

 densation will grow larger, so that the condensed 

 sphere within the granulated liquid will successive 1 ' 

 ly be larger and larger ; or by the side of the large 

 one there will be several small spheres developed, 

 growing at some distance from them, and remain^ 

 ing isolated. And perhaps some two such spheres 

 will begin to separate, or a separation of the part 

 which contains only clear granules from the part 

 in which a condensation has taken place, will occur 

 in this way, and then those spheres with two cen-< 



