|| Very good condition. First edition. Offprint. Original wrappers. Ownership stamps of Edmund B. Wilson and A.W. Pollister and institutions stamp on front cover.* Some splitting at spine. An interesting overview of the state of biological research at the end of the 19th Century. Mentions Flemming, De Vries, Hertwig, Balbiani, Van Beneden, Darwin, Strasburger, etc.. Scarce.