XN 
° 
1921] CHOATE—WHEAT GERMINATION 425 
19. Scuutze, E., Uber den Umsatz der Ejiweissstoffe in der lebenden Pflanze. 
Zeit. Phys. Chemie 30:241-312. 1900 
- ScHuizE, E., and Castro, N., Beitrige zur Kenntniss der Zusammen- 
sutzung und des Stoffwechsels der Keimpflanzen. Zeit. Phys. Chemie 
38:199-258. 1903. 
- THompson, T. G., Total amino nitrogen in the seedlings of the Alaska pea. 
Jour. Amer. Chem. Soc. 37:230-235. 1015. 
2. TorREY, J. C., Cytological changes panying tl tion of diastase. 
Bull. Torr. Bot. Club 29:221-235. 1902. 
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EXPLANATION OF PLATE XXVIII 
1G. 1.—Wheat seedling, two days old: a, old kernel; 6, coleoptile; 
c, coleorhiza; d, zone of root hairs; é, root cap; 
IG. uter layer e pericarp showing cuprous oxide precipitated by 
F Mickiger's S reagent; X15 
G. 3.—Root cap, ane starch stained with iodine (3 days old); 
112. 
Fic. 4.—Detail of root cap; Xr 
Fic. 5.—Root hair showing crystals formed by osazone test; X 275. 
Fic. 6.—Asparagine crystallized out in absolute alcohol in coleoptile 
ene 7 days old); 45 
-—Copper Raiser formed by addition of copper acetate and 
ache alcohol in coleoptile (material 7 days old); 150. 
Fic. 8.—Epithelial cells of scutellum when placed in germinator; X150. 
Fic. 9.—Epithelial cells of scutellum after 7 days in germinator; X150. 
