The average man may regard this sensibility on the question of birth as preposterous and hardly credible; but with the utmost respect for his knowledge as the rock from which all other knowledge is hewn, it must be admitted that many well-proved facts are dark to the average man, even concerning the action of his own heart and the structure of his own retina. 
The average man may regard this sensitivity on the question of birth as preposterous; but the average man does not even understand the action of his own heart and the structure of his own retina, let alone his