[BAKER] VESTIGIAL CENTRIPETAL XYLEM 69 



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Morphol, Betrachtung d. Blatter in Sciadopitya (Bot. Zeit. XXIX, p. 1. 

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13. Thomas — 



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14. Thomson, R. B.— 



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15. — 



The Spur Shoot of the Pines. Bot. Gaz. 57, pp. 362-385. 1914. 



16. WORSDELL, W. C— 



On "Transfusion-tissue," its Origin and Function in the Leaves of Gymnos- 

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