22 
Miyake, The developinent of the gametophytes etc. 
the original size in reproduction. The photomicrographs are taken with the 
following oculars and objektives: 
Figs. 106 a, 106 b, 107, 112—114: Zeih Apochromat 2 mm, Comp. Oc. 4. 
Figs. 108—111: Zeih Obj. B, Comp. Oc. 4. 
Plate I. 
Fig. 1. Microspore mother-cell. X 1330. 
Fig. 2. The same in sinapsis. X 1330. 
Fig. 3. Spirem stage. X 1330. 
Fig. 4. Late spirem stage just before the formation of chromosomes. 
X 1330. 
Fig. 5. Diakinesis stage. X 1330. 
Fig. 6. Multipolar spindle. X 133Ö. 
Figs. 7—8. Equatorial plate stage of spindle. X 1330. 
Fig. 9. The same viewed from pole; twelve bivalent chromosomes are 
seen. X 1330. 
Figs. 10—11. Spindle in anapbase. X 1330. 
Fig. 12. Telopbase. X 1330. 
Fig. 13. Daughter-nuclei formed. X 1330. 
Fig. 14. Spindle of second division in metapbase. X 1330. 
Figs. 15—16. The same in telopbase. X 1330. 
Fig. 17. Late telopbase. X 1330. 
Fig. 18. Four grand-daughter-nuclei formed. X 1330. 
Fig. 19. Young microspores. X 1330. 
Fig. 20. Microspore mucb more enlarged. X 1330. 
Fig. 21. Mature microspore. X 660. 
Figs. 22—25. Successive stages in first division of microspore. X 660. 
Fig. 26. Mature pollen-grain, containing generative and tube-cells. X 660. 
Fig. 27. Generative cell little after division; stalk-nucleus still attached 
to the body-cell. X 660. 
Fig. 28. Body-cell, stalk- and tube-nuclei, which are found in young 
pollen-tube. X 660. 
Fig. 29. Body-cell and one of two nuclei. X 660. 
Fig. 30. A part of young pollen-tube with body-cell and two nuclei # 
X 660. 
Fig. 31. Pollen-tube about half way penetrated the nucellar cap, with 
body-cell and two nuclei X 660. 
Fig. 32. Lower part of pollen-tube wbicb bas almost completed the 
Penetration of nucellus. X 660. 
Fig. 33. A still later stage. X 660. 
Fig. 34. Fully-formed body-cell with two nuclei. X 660. 
Fig. 35. Two sperm-cells: a free nucleus found below tbem sbows sign 
of degeneration. X 660. 
Plate II. 
Fig. 36. Oblique cross-section of a megaspore mother-cell, in synapsis. 
X 1330. 
Fig. 37. Longitudinal section of megaspore mother-cell, in spirem stage. 
X 1330. 
Fig. 38. Nucleus of megaspore mother-cell in diakinesis. X 1330. 
