JO H. JEANETTE ALLEN. 



EXPLANATION OF PLATE II. 



FIG. 9. Transverse section of a five-day chick showing glycogen (stippled) in 

 the myotomes and intestine, m.y., myotomes; int., intestine 



FIG. 10. Sagittal section through the posterior end of a seven-day chick showing 

 glycogen (stippled and dotted) in the myotomes. m.y., myotomes. 



FIG. ii. A myotome in sagittal section. Five days. High power. The 

 black areas are glycogen. 



FIG. 12. Transverse section of the medulla oblongata of a six-day chick. 

 (Glycogen stippled.) m., medulla; s.m., septum medullae. 



FIG. 13. Sagittal section of the septum medullae. Six to seven days. (Gly- 

 cogen stippled.) c., cord, s.m., septum medullae. 



FIG. 14. Transverse section of spinal cord (lumbar region) of a ten-day chick, 

 showing glycogen (stippled) in the cartilage of the vertebra, the floor of the cord 

 and a mass of nerve cells in the dorsal fissure, ca., cartilage; ., glycogenated 

 nerve tissue. 



FIG. 15. Glycogenated muscle near the eye of a six-day chick. (Glycogen 

 stippled.) dien., diencephalon; no., optic nerve; o., eye. 



FIG. 16. Glycogenated muscles near the eyes of a seven-day chick. (Abbre- 

 viations as in 15.) 



FIG. 17. Glycogenated cartilage of developing skull. Seven to eight days 

 ca., cartilage; dien., diencephalon; o., eye; ph., pharynx. 



FIG. 1 8. Developing centrum in the head of a ten-day chick, showing glyco- 

 genated area in stippling, ca., cartilage. 



FIG. 19. Glycogenated cartilage and muscles of the foot of a ten-day chick. 

 (Glycogen stippled and dotted.) ca., cartilage; m., muscles. 



FIG. 190. Cartilage of the same under high power. 



FIG. 20. Pectoral muscles and cartilage of a ten-day chick. 



