INDEX. 



Abdominal cavity, origin, 87 



Abozzo, 9 



After-birth, denned, 360 



Alcohol, 380 



Allantois, chick, 214 



general account, no 



human, 136, 142, 374 



in umbilical cord, 374 



origin, 83 



in primates, 123 



pig, 9.0 mm., 253 



17.0 mm., 310, 311 



and chorion in ungulates, 113 

 Alum cochineal, 381 . 



hematoxylin, 382 

 Amiurus, 51 



Amnio-cardiac vesicles, chick, 180, 186 

 Amnion, general account, 117 



human, at two months, 370 

 at three months, 344 

 after fifth month, 371 

 at seven months, 345 

 structure, 370 



origin, 83 



in primates, 122 



raphe, chick, 203, 210 

 Amniota, 7 

 Anal plate, 58, 59 



origin of, 54 

 Anamniota, 7 

 Angioblast, chick, 187 



development, 91 



early history, 80 



first appearance, 66 

 Anlage, defined,- 9 

 Annelids, 9 

 Anterior cavity, 88 

 Anura, 8 



Anus, origin of, 54 

 Aorta, chick, 191, 192, 200, 202, 205 



Aorta, descending, pig, 6.0 mm., 247 



12 . o mm., 274, 281 

 dorsal, pig, 9.0 mm., 255 



12. o mm., 282, 283, 285 

 17.0 mm., 305 

 first appearance, 93 

 Aortic arches, chick, 184, 202 

 general account, 100 

 human, 142, 144, 145, 146 

 pig, 6. o mm., 247 



12. o mm., 278, 293 

 Zimmermann's, 100 

 Aortic system, general account, 99 

 Appendages, embryonic, absence in lower verte- 

 brates, 82 



Arachnoid, pig, 9.0 mm., 254 

 12 .o mm., 266 

 17.0 mm., 305 

 20. o mm., 325 

 Archenteron, general account, 57 



origin of, 54 

 Area, germinal, 96 



opaca, defined, 64 



first appearance, 97 

 pellucida, defined, 64 



first appearance, 97 

 vasculosa, 50, 66, 91 



first appearance, 97 

 of rabbit, 98 

 vessels of, 97 

 vitellina, 65 

 Arteries, basilaris, pig, 9.0 mm., 258 



12 .o mm., 264, 293 

 carotid, pig, 12 mm., 235, 271, 274 



loop, pig, 264 

 central of retina, 333 

 intersegmental, pig, 6.0 mm., 249 

 9.0 mm., 250 

 12 . o mm., 301 

 lingual, 329 



393 



