Pressure, mechanical, a cause of modification, ii. [344]-[345].
Prevost and Dumas, on the employment of several spermatozoids to fertilise one ovule, ii. [363].
Price, Mr., variations in the structure of the feet in horses, i. 50.
Prichard, Dr., on polydactylism in the negro, ii. [14];
on the Lambert family, ii. [77];
on an albino negro, ii. [229];
on Plica polonica, ii. [276].
Primrose, ii. [21];
double, rendered single by transplantation, ii. [167].
Primula, intercrossing of species of, i. 336;