1. Hamilton, H. L., Lillie's Development of the Chick: 343 (1952).
2. Lillie, R. D., Histopathologic Technique and Practical Histochemistry: 39 (1954).
3. PERSONAL COMMUNICATION
4. Rabl, C., Zeitschrift für wissenschaftliche Zoologie 65: 257 (1899).
5. UNPUBLISHED RESULTS