PLATE -Continued. 
Fig. Sparganium ramosum. X 450. 
41, 42. — Arrangement and first formation of the vegetative cell. 
43, 44. — Cruslied-out Pollen-bodies showing the metamorphoses of the 
vegetative nuclei. 
45 — 48. — Pollen-tubes. 45. The vegetative nucleus in the act of 
dividing. 46. The vegetative nucleus has gone first, and has in 47 divided. 
48. The vegetative nucleus has remained undisturbed. 
Asphodelus albus. X 350. 
49 — 53.— Development of the Pollen-bodies from the first appearance of 
the vegetative cell until maturity. 
Andropogon campanus. X 400. 
54. — Pollen-body after division. 55. Same seen at an angle of 90A 
56. — The vegetative cell divided. 57. Same seen fron the side. 
58. — Pollen-body with three vegetative cells. 59. Tie same seen at an 
angle of 90°. 
60. — Both vegetative cells become free. 
Bromus erectus. X 350. 
61, 62. — Pollen-bodies after division. 
63 — 65. — Formation of the vegetative cell. 
66. — Division of the vegetative cell. 
67 — 69. — Metamorphosis of the vegetative cell and tie larger nuclei up 
to the maturity of the Pollen -body. 
Arum ternatum. X 600. 
70, 71. — First development of the Pollen-bodies after livision. 
72. — Pressed-out body ; the division of the vegetativeiuclei is only seen. 
73. — Mature body; the spectacle-like united vegetatve cells are still 
maintained. 
74. — Nuclei pressed out of mature bodies. 
Butomus umhellatm. X 300. 
75. — First division of the Pollen-bodies. 
76. — The vegetative nucleus has in addition divided. 
77. 79. — Pollen-tubes; in 78 and 79 the partition wlls are still main- 
tained. 
Juncus ariiculatus. X 300. 
80. — Pollen-body after division. 81. Older body. 
Heliocharis palustris. X 350. 
82 — 94. — Development of the Pollen-body to maturity. 90 and 91 show 
the gradual resorption of the three nuclei situated in theiarrow end. 
95. — Normal thickening of the intine of a mature body. 
96 — 98. — Peculiar thickenings of the membrane, which ccasion the for- 
mation of false partition walls. 
99 — 102. — Pollen-tubes. 
