xiv TABLE OF CONTENTS. 



Practical directions for obtaining and studying chick embryos, 437 

 460. Examination of a 36 48 hours embryo, 437 444. Of an 

 embryo of about 4850 hours, 444447. Of an embryo at the end 

 of the 3rd day, 447451. Of an embryo of the 4th day, 451453- 

 Of a blastoderm of 20 hours, 453 456. Of an unincubated blasto- 

 derm, 457. Of the process of segmentation, 458. Of the later changes 

 of the embryo, 459. Of the development of blood-vessels, 459, 460. 



Practical directions for obtaining and studying Mammalian em- 

 bryos, 460 471. Animals and breeding, 460, 461. Examination and 

 treatment of segmenting ova, 461 464. Of the blastodermic vesicle, 

 j2 90 hours, 465. Of the blastodermic vesicle of 7 days, 465, 466. 

 Of an 8 days embryo, 466 468. Of an embryo of 8 days 12 hours, 

 468, 469. Of the foatal membranes of an embryo of 14 days, 469, 

 470. 



NOTE A. Automatic microtome, 471. 



NOTE B. New method of mounting sections, 47 1 . 



