THE PRIMARY FACTORS OF ORGANIC EVOLUTION. By _Prof. E. D. Cope_. Cuts, 121. Pp., xvi, 547. Cl., $2.00 (10s.). DARWIN AND AFTER DARWIN. An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions. By _George John Romanes, LL. D., F. R. S., etc._…
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