...conclusion that the auditory organ arose by the invagination of a single superficial sense-organ, it is by no means certain that this is true ; for there...by the bringing together of two originally distinct sense-organs which were together sunk below the surface. The main facts at present in favor of this...

...to the development of the ear are of great importance. "Although ontogeneiic evidence," he says, f " seems to lead to the conclusion that the auditory...organs which were together sunk below the surface." He then gives the evidence for this, which is mainly the distinct origin of the nerve roots which supply...

...conclusion that the auditory organ arose by the invagination of a single superficial sense-organ, it is by no means certain that this is true ; for there...by the bringing together of two originally distinct sense-organs which were together sunk below the surface. The main facts at present in favor of this...

...conclusion that the auditory organ arose by the invagination of a single superficial sense-organ, it is by no means certain that this is true ; for there...by the bringing together of two originally distinct sense-organs which were together sunk below the surface. The main facts at present in favor of this...

...certain facts of comparative anatomy and certain phylogenetic considerations which * P. 227. t P. 231. point to the conclusion that the auditory organ has...organs which were together sunk below the surface." He then gives the evidence for this, which is mainly the distinct origin of the nerve roots which supply...