312 BOTANICAL GAZETTE [ NOVEMBER 
Clematis ligustictfolia Nutt. 
Fic. 25. Longitudinal section of a mature pistil, showing. the accessory 
ovules. X 75. 
Anemone Caroliniana Walt. 
Fic. 26. Longitudinal ventral section showing the formation of the inverted 
Y-shaped suture. X 120. 
Delphinium Carolinianum Walt.. 
Fic. 27. Longitudinal ventral section of a pistil before the appearance of 
the ovules. X 12 
1G. 28. Cross section, in the line dd, of a slightly older pistil, but with 
as yet no ovules. X 125. 
FIG, 29. Cross section of a pistil showing avates, a 75s 
Fic. 30. Longitudinal ventral section of a pistil. « 75. 
Caltha leptosepala DC. 
Fic. 31. Cross section of a pistil ready for pollination. x 75. 
Sagittaria latifolia Willd. 
Fic. 32. Longitudinal section of an ovule with two archesporial cells. 
X 520. 
1G. 33. Longitudinal section of a pistil showing a single archesporial 
cell. X 540. 
FiG. 34. Cross section of a pistil in the line e-e of fig. 77. XK 525- 
Fic. 35. tela section of a pistil a little further developed than the 
preceding. x 4 
a 
FIG. 36. en section of a pistil with an embryo sac containing 
two nuclei. x 1 
155. 
Fic. 37. Longitudinal section of a pistil ready for pollination. X 75. 
Alisma Plantago aquatica L. 
G. 38. Longitudinal section of a young flower showing the young pistil. 
The nies line shows the level of the surface of the receptacle. X 155. 
FiG. 39. Longitudinal ventral section of a pistil slightly older than the 
preceding. X 555. 
Fic. 40. Longitudinal section of a young pistil in which the ovule is just 
beginning to appear. x 
Fig. 41. Longitudinal section of a pistil showing the archesporium. The 
section is slightly to one side of the median plane. X 555. 
G. 42. Longitudinal section of a pistil at a further stage of development 3 
than a preceding. x 400. 4 
