INDEX. 



377 



Nervous system, hollow, 20 



origin of, 69 

 Neural crest, chick, 299 

 Neuraxons, pig, 12 mm., 184 

 Neurenteric canal, 70 

 of gibbon, 128 

 of man, I30 

 Neuromeres, chick, 292 



pig. 6 mm., 229 



pig, 12 mm., 178 

 Neurone layer. See Cinerea. 

 Neuropore, anterior, 71, 296 

 Notochord, 67 



anlage of, in gibbon, 128 



chick, 278, 288, 289, 290 



pig, 12 mm., 187 



pig, 17 mm., 233 



pig, 20 mm., 246 



pig, 24 mm., 266 



ultimate fate of, 68 



vertebrate, 19 



young chick, 299, 303 

 Notochordal canal, 66 

 Nussbaum's theory, 40 



O. 



Qisophagus, pig, 12 mm., 196, 201 



pig, 17 mm., 233, 234 



pig, 20 mm., 242, 246 



pig, 24 mm., 267- 

 Olfactory nerve, development, 255 



pits. See Nasal pits. 



plate, pig, 9 mm., 219 

 pig, 12 mm., 193 

 Omentum, great, 204 



lesser, 204 

 Operculum, 227 

 Optic chiasma, anlage of, 207 

 pig, 24 mm., 265 



nerve, chick, 292 



stalks, pig, 12 mm., 186 



vesicles, chick, 297 



primary, 73 



Oral cavity, pig, 20 mm., 240 



fissure, pig, 12 mm., 187 



plate, 100 

 Orange G, 368 

 Organ of Jakobson, 255 

 Organs, constitution of, 36 

 Otocyst, chick, in section, 274 

 in surface view, 273 



pig, 6 mm. , 229 



pig, 12 mm., 176, 177, 208, 215 

 in frontal section, 214 

 Ovulation, 46 

 Ovum, arrival in uterus, 59 



before maturation, 45 



entrance of spermatozoon into, 50 



holoblastic, 26 



human, 45 



impregnation of, 49 



Ovum, maturation of, 47 

 meroblastic, 26 

 of mouse, 312 



method of obtaining, 312 

 segmentation of mammalian, 54 



P. 



Palate, cleft, 241 



shelf, pig, 20 mm., 240 

 Panchoroid, pig, 12 mm., 181 



pig, 20 mm., 250 

 Pancreas, pig, 24 mm., 267 

 Pangenesis, 41 

 Parathyroid glands, 244 

 Parietal zone, 79 

 Parker's fluid, 364 

 Peduncles of brain, 207 

 Penis, 247 



Pericardial membrane, 198 

 Perichondrium, origin of, 233 

 Peritoneum, 202 



pig, 20 mm., 250 

 Peters's ovum, 123 

 Pharynx, chick, 276, 277, 278, 281 



early human, 144 



pig, 12 mm., 184 



vertebrate, 19 



young chick, 299 

 Pia mater, pig, 9 mm., 222 

 pig, 12 mm., 180 

 pig, 17 mm., 233 

 pig, 20 mm.. 253 

 Picro-sulphuric acid, 364 

 Pig, 6 mm., sections of, 228 



9 mm., sections of, 217 



10 mm., external form, 160 

 12 mm., brain of, 175, 205 



diagram of planes of sections, 174 

 frontal sections of, 21 1 

 general anatomy of, 162 

 sagittal sections of, 205 

 studied in sections, 173 

 transverse sections of, 175 

 15 mm., external form, 170 

 17 mm., sections of, 231 

 20 mm., sections of, 240 

 24 mm., median sagittal section of, 263 



sections of, 259 

 embryos, 157 



external form, 159 

 methods of obtaining, 157 

 planes of sections of, 158 

 reconstructions of, 162 

 selection of stages, 159 

 serial sections of, 158 

 Pigment layer of eye, 262 

 Pineal organ, 263 

 Pituitary body, 183 



pig, 24 mm., 265 

 Placenta after delivery, 336 

 at seven months, 321 

 cotyledons of, 337 



