Note 25 — Chapter XVIII · ON THE ADVANTAGES AND DISADVANTAGES OF CHANGED CONDITIONS OF LIFE: STERILITY FROM VARIOUS CAUSES.
Reading edition
See ‘Annual Reports Zoolog. Soc.,’ 1855, 1858, 1863, 1864; ‘Times’ newspaper, Aug. 10th, 1847; Flourens, ‘De l’Instinct,’ p. 85.