American journal of physiology . Figure 5. — Agglutination of Ciiaetopterus eggs after treatment with KCl, and origin ofgiant embryos. The drawings were made after the eggs had reached the trochophorestage. 1. Single trochophore. 2. Two trochophores grown together but with inde-pendent organization. 3, 4, 5. The dark centres are independent, but the clear mar-gins are partially fused. 6. The centres still independent, but the margin completelyone. 7. Fusion of two eggs complete, giant embryo. S and 9. Fusion of three eggs. larger dimensions. I have never observed giant embryos in the par-theno
American journal of physiology . Figure 5. — Agglutination of Ciiaetopterus eggs after treatment with KCl, and origin ofgiant embryos. The drawings were made after the eggs had reached the trochophorestage. 1. Single trochophore. 2. Two trochophores grown together but with inde-pendent organization. 3, 4, 5. The dark centres are independent, but the clear mar-gins are partially fused. 6. The centres still independent, but the margin completelyone. 7. Fusion of two eggs complete, giant embryo. S and 9. Fusion of three eggs. larger dimensions. I have never observed giant embryos in the par-thenogenetic eggs of sea-urchins. But I have seen them in almostevery experiment in which the Chaetopterus eggs had been treatedwith potassium. In such cases often two or more eggs would sticktogether, and the result was either two or more trochophores grown 1 Driesch: Archiv fiir Entwickelungsmechanik, 1900, x. p. 411. ^ Morgan : Archiv fiir Entwickeluncjsmechanik, 1895, ii. p. 65. ^ ZuK Strassen : Archiv fiir Entwickelungsmechani
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