508 



ON SEEDLINGS 



sides, the ovule Ov, perianth P, and SS the two large, spread- 

 ing, papillose stigmas. The cavity of the ovary is small and 

 nearly filled by the ovule. 



By about the middle of June the young fruit has grown 

 considerably in thickness, though not much in length. The 

 ovary and ovule are longer, and at the base of the former the 

 tissue has in two places (fig. 656, Co, Co) become almost colour- 

 less from the removal of the protoplasm. 



By the end of June the fruit has still further increased in 

 length as well as in breadth. The growth in length has 

 especially taken place between the base and the uppermost 



FIG. 656. Pterocarya caucasica. 

 Longitudinal section of fruit, x 6. 

 June 25. Co, Co, two places where 

 the tissue has become colourless. 

 (Other letters as in fig. 655.) 



FIG. 657. Pterocarya caucasica. 

 Transverse section of fruit, x 8 : 

 W, W, wings ; PC, pericarp ; 

 Co, Co, Co, Co, four spaces of 

 altered tissue ; Ov, ovule. (Other 

 letters as in fig. 655.) 



point of attachment of the bracteoles, which therefore seem 

 to have been carried up. The bracteoles have also increased in 

 size, while the perianth remains unaltered. The two masses of 

 colourless tissue as seen in longitudinal section at the base of 

 the ovary are still solid or unbroken. 



The fruit continues to grow rapidly, especially at the base, 

 so that by the end of July the posterior half of the bracteoles 

 seems to be carried still further up, distinctly more so than the 

 anterior. The neck of the fruit, on the contrary, has increased 

 considerably in thickness, but scarcely at all in length. Fig. 

 657 represents a transverse section, and on each side of the 

 ovule (Co, Co, Co, Co} are the four approximately circular 



