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1907] 



KILDAHL—PROEMBRYO OF PINUS LARICIO 



107 



PLATE IX 



Fig. 7. Section showing the two walls more nearly in the same stage, but 

 the cross wail a little in advance of the vertical. X425. 



Fig. 8.- Section showing the vertical walls of each tier formed by the fibers 

 from the nuclei of their respective tiers; the cross wall nearly complete. X350. 



Fig. 9. Same as fig. 8; the broad effect of the vertical wall caused by the section 

 being cut a little to one side of the crossing of the two vertical walls. X 350. 



Fig. 10. Second division. X425. 



Fig. II. Second division, X3S5. 



Fig. 12. Third division. X393. 



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