1632 - Weismann, A. and C. Ischikawa.

Weismann, A. and C. Ischikawa. On the Formation of Directional Bodies in Animal Eggs. Submitted by the authors. Freiburg im Breisgau, J.C.B. Mohr 1887. 44 p. 4 fold. lithogr. plts. - ╔Cited in: Ibid.╗ Further Investigations into the Numerical Law of Directional Bodies. 575–610 p. 3 folios. lithogr. plts. - ╔Weismann, A.╗ On the Number of Polar Bodies and Their Significance for Inheritance. Jena, 1887. 75 pp. - ╔Weismann, A. and C. Ischikawa.╗ On paracopulation in Daphnia eggs, as well as on their maturation and fertilization. 155–196 pp. 4 double-page lithographic plates. Contemporary half-leather binding. Nos. 2 and 4 bear a stamp; presented by the author. No. 3 bears a handwritten dedication by A. Weismann. 4 first editions. D.S.B. XIV, p. 235: "In 1887 he reported on the research he had undertaken, aided by his pupil and collaborator C. Ishikawa (who later became a professor of zoology at Tokyo). He described the increasing complexity of the ancestral plasms, and it was his theory that there were two kinds of divisions." An interesting collection. - 59.