50 



THE MICROSCOPE AND ITS BEVELATIO.NS. 



SEXUAL (?) REPRODUCTION OF INFUSORIA (after Balbiani). 



Fig. 1. Conjugation of Paramecium aurelia : a, ovarium (nucleus) ; b seminal capsule (nucleo- 

 lus): c, oviducal canal; d, seminal canal; e, buccal fissure. 



2. The same, more advanced; a, ovary, showing lobulated surface; 6, 6, secondary seminal 

 capsules. 



3. One of the individuals in a still more advanced state of conjugation, showing the ovary a, rc, 

 broken up into fragments connected by the tube m ; b, 6, seminal capsules ; v, contractile vesicle. 



4. Paramecium, ten hours after the* conclusion of the conjugation ; a, a, unchanged granular 

 masses of the ovary, of which other portions have been developed into the ova, o, o, still contained 

 within the connecting tube m ; 6, 6, seminal capsules. 



5. The same, three days after the completion of the conjugation. 

 6-12. Successive stages in the development of the seminal capsules. 

 13-18. Successive stages in the development of the ovules. 



19. Acinetae. in different stages, A, B, c 



20. Paramecium containing -three ^Icmeto-parasites, q, q, q, lying in introverted pouches, of 

 which the external openings are seen at #, x, 



21. Stentor in conjugation. 



