99 



obtained their final shape. The very 



youngest floral primordia become 



visible. 

 Fig. 11, 12. Longitudinal sections of 



floral pi-imordia of the inflorescence 



drawn in fig. 10. X 250. 

 Pig. 13. Longitudinal section of young 



Q flower. X 67. The carpellae are 

 as yet of unequal size and have not 

 yet met. 

 Fig. 14. Longitudinal section of somewhat 

 older V flower. X 67. The carpellae 

 have just met in the median line. 



PLATE V. 



Fig. 15. Longitudinal section of young 

 female flower showing the two Car- 

 pellae, the ovarial cavity and the 

 nucellus. X 175. 



Fig. 16. Idem, showing the embryosacs 

 arisen from the direct transformation 

 of a sabepidermal cell. X 175. 



Fig. 17. Longitudinal section of a some- 

 what older flower showing the dis- 

 appearance of the ovarial cavity, the 

 concrescence of the carpellae and 

 two binucleated embryosacs. The 

 number of cellrows between the two 

 embryosacs is abnormally large in 



this flower usually but two or three 

 such rows are present. X 250. 



Fig. 18. Longitudinal section of a young 

 female flower, showing hairs having 

 penetrated from the side between 

 the carpellae thus preventing them 

 from meeting in the median line. 

 X 67. 



Fig. 19. Stigma of adult flower, artifi- 

 cially pollinated. X 175. 



Fig. 20. Crosssection of adult style showing 

 the large-celled epidermis and the 

 central thick-walled tissue. X 175. 



PLATE VL 



Fig. 21. Longitudinal section of inflo- 

 rescence showing the final shape of 

 the scales. The young flowers show 

 their placenta which has been painted 

 violet. X 17. 



Fig. 22. Longitudinal section of a female 

 flower, showing the collapse of the 



embryosac to the left. By this col- 

 lapse the ovarial cavity becomes 

 again visible. X 250. 

 C iz: carpellae ; N = nucellus; E = 

 embryosac; Obi. E :== obliterated em- 

 bryosac ; C = ovareal cavity. Obi. 

 N = obliterated Nucellus. 



PLATE VIL 



Fig. 23 and 32. Two primary endosperm- 

 nuclei. Gentian violet-stain followed 

 by a submersion in double iodide of 

 potassium. Oilimmersion. X 1200. 



Fig. 24. Microtomesection of binucleated 

 embryosac X 600. Double stain after 



Flemming. 

 Fig. 25, 26, 27, 28, 29, 30, 31. Conse- 

 cutive microtomesections of a quadri- 

 nucleated embryosac. X 400. Double- 

 stain with saffranine and gentian- 

 violet. 



PLATE VIIL 



Fig. 33, 34, 35, 36. Consecutive mi- 

 crotome-sections of an adult embryo- 

 sac demonstrating the presence of 

 an eggcell, two synerpridae and a 

 primary endospermnucleus. Antipodes 

 were not present. X 250. 



Fig. 37. Longitudinal section of inner 

 part of adult female flower. X 250. 

 It is from this section that fig. 39 

 has been drawn. 



The peripheral celllayer of this 

 drawing is the internal epidermis of 



