1898 | COMPARATIVE MORPHOLOGY OF PISTILS 311 
Fic. 6. Cross section of a pistil in the same flower as fig. 5, in the line d-é. 
x 565. 
Fig. 7. Longitudinal section of a pistil at the time of formation of the four 
megaspores. X 224. 
Fic. 8. Longitudinal section of fully developed pistil. x 250. 
Ranunculus eremogenes Greene. 
FiG. 9. Longitudinal section of two very young pistils. x 565. 
Fic. 10. Longitudinal section of the ovule during the formation of the four 
megaspores. X 565. 
Myosurus minimus L. 
Fic. 11. Longitudinal section of a very young pistil. X 565. 
Fic. 12. Cross section of apical part of a pistil from the same flower as 
Re 21. XK 655. 
FiG. 13. Cross section of the basal part of a pistil from the same flower. 
565. 
Fic. 14. Longitudinal section of a pistil at the time of the appearance of 
the archesporium. x 565. 
Fic. 15. Longitudinal section of a pistil at a later stage than in the pre- 
ceding figure. X 265. 
Fic. 16. Longitudinal section of a pistil amen maturity, but with 
the embryo-sac not far developed as yet. X 2 
Fic. 17, Longitudinal section of a pistil a tle older. X 205. 
Fic. 18. Longitudinal section of a mature pistil. X 125. 
Ranunculus eremogenes Greene. 
Fic. 19. Longitudinal ventral section of a eons showing the formation of 
the suture shaped like an inverted Y. x 250 
Anemone cylindrica Gray. 
FIG, 20. Longitudinal section of a young pistil, showing the beginning of 
the formation of the axillary body. X 540. 
Fig. 21, Longitudinal section of the pistil at the time of the formation of 
the archesporium. x 535. 
Anemone Caroliniana Walt. 
1G. 22. Longitudinal section of a pistil at the time of formation of the 
archesporium. x 2 50. 
FiG. 23. Longitudinal section of a pistil with the embryo sac developed 
about halfway. x 120. 
IG. 24. ppietes of a pistil from the same flower as the preceding, in the 
line c-c. x 1 
