INDEX. 635 



Pronucleus, female : 8, 13, 14; Frog, 100 ; Rabbit, 351 



Pronucleus, male : 13, 14 ; Frog, 100 



Protovertebra : Amphioxus, 84-85 ; Chick, 244, 322, 324 ; Man, 482, 490, 495 



Protovertebral segmentation : Chick, 326 



Protozoa: characters of, 1-2 ; reproduction of, 34 



Pterylia : Chick, 337 



Pubes : Frog, 214 ; Chick, 334 



Pulmo-cutaneous arch : Frog, 179 



Pulmonary arch : Babbit, 417 



Pulmonary trunk : Chick, 306 ; Rabbit, 416; Man, 572, 573, 575 



Pulp cavity of tooth: Frog, 211 



Pupil : Chick, 279 



Pygostyle : Chick, 328 



Pylangium : Frog, 168, 169 



Pyramid of thyroid : Man, 558 



Quadrate cartilage : Frog, 205-206, 207-208 ; Chick, 330 

 Quill: Chick, 336 



BABBIT, 341-447 : preliminary account, 341-344 ; the egg, 344-351 ; the 

 early stages of development, 351-362 ; general history of the embryo, 

 362-371 ; nervous system, 371-387 ; sense organs, 387-399 ; digestive 

 system, 399-412; heart and blood-vessels, 412-421 ; excretory system, 

 421-426 ; crelom, 427-428 ; muscular system, 429 ; skeleton, 429- 

 433 ; skin, 433-434 ; placenta, 434-445 ; bibliography, 445-447 



Rate of development: Amphioxus, 48 ; Frog, 91 ; Rabbit, '6^2, 367 



Rauber's layer : Rabbit, 358, 361 



Recapitulation theory : 24-34, 45, 90 



Recessus labyrinthi : Man, 541-542 



Recessus vestibuli ; Frog, 142; Rabbit, 393, 395; Man, 541, 542 



Rectal diverticula ; Chick, 291 



Rectification of cranial flexure : Frog, 120 



Rectum : Chick, 291 ; Man, 549 



Regeneration of uterine epithelium : Rabbit, 445 ; Man, 615 



Reichert's ov-um : Man, 472-476 



Rejuvenescence : 17 



Reproductive organs: Amphioxus, 88-89; Frog, 94-96, 197-198; Chick, 228- 

 230, 319-320; Rabbit, 344-346, 426; Man, 449-455, 591- 

 598 



Respiration of embryo : Chick, 228, 294 ; Rabbit, 435 ; Man, 613 



Retina: Frog, 138 ; Chick, 278; Rabbit, 389 ; Man, 540 



Rib : Chick, 327-328 ; Rabbit, 430-432 ; Man, 549 



Ripening of egg : 7-11; Frog, 96-99; Hen, 230-231 ; Rabbit, 349-350 ; Man, 

 471 



Roots of cranial nerves : Man, 531, 534-535 



Roots of spinal nerves : Man, 524-526 



Rosenmiiller, organ of : Man, 595 



Sacculus: Frog, 141 ; Rabbit, 396 ; Man, 541-542 



Saccus endolymphaticus : Frog, 142 



Sacral vertebra : Chick, 328 



Salivary gland : Man, 559 



Scala media : Rabbit, 397 ; Man, 543 



Scala tympani : Rabbit, 397 ; Man, 543 



Scala vestibuli : Rabbit, 397 ; Man, 543 



Scapula : Frog, 213 ; Chick, 332 



Schizoccel : Chick, 243 



Sclerotic : Rabbit, 392 



Scrotal sac : Rabbit, 426 



Scrotum : Man, 597 



Second month : Man, 503-505 



