PLATE 2 



EXPLANATION OF FIGURES 



4a Blood corpuscle, embryo of Fundulus three days old. Fixation: Regaud; 

 stain: fuchsin-methylgreen. Ocular 12. 



4b From the same eml)ryo: anaphase of the mitosis of a blood oori)uscle. 

 Ocular 12. 



4c Wandering cell from peritoneal cavity, embryo of Fundulus, nine days 

 old. Fixation: Benda (without acetic acid); stain: fuchsin-methylgreen. Ocu- 

 lar 8. 



5 Cross section of a Wolffian duct, with neighboring mesenchyme-cells, of 

 an embryo of Fundulus, three days old. Fixation: Regaud; stain: fuchsin- 

 methylgreen. Ocular 8. 



6a Posterior part of the intestine of an embryo of Fundulus, three days 

 old. Fixation: Regaud; stain: fuchsin-methylgreen. Ocular 12. 



6b Anterior part of the intestine of the same embr^^o. Ocular 12. 



6c Intestine of an embryo of P'undulus, nine days old. Fixation: Regaud; 

 stain: fuchsin-methylgreen. Ocular 12. 



6d Intestine of an embryo of Trout, 24 days old (the ot-her embryos of the 

 same lot hatched two days later). Fixation: Benda; stain: Benda. Ocular 12. 



490 



