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Acknowledgements This experiment was made possible through the joint efforts of Jake Beckman, Anisha Chandra, Lauren Fety, Laura Twichell, and Marielena Velez of the Developmental Biology Laboratory at Swarthmore College under the supervision of Judith Cebra-Thomas and William Gresh.   Literature Cited Dunn B.E., Clark N. B., Scharf K. E. 1987. Effect of calcium supplementation on growth of shell-less cultured chick embryos. Journal of Experimental Zoology [Supplement] 1:33-37. Gilbert, S. F. 2003. Developmental Biology, 7th ed. Sunderland: Sinauer Associates, 517. Hamburger, V. 1960. A Manual of Experimental Embryology. Chicago: The University of Chicago Press, pp. 79-81. Tuan, R. S. 1987. Mechanism and regulation of calcium transport by the chick embryonic chorioallantoic membrane. Journal of Experimental Zoology [Supplement] 1:1-13.