PLATE XXV. 



A, I'lNrs IIETKROPHYLLA. Hailial ami tangential sections (if a transverse Tesin duct; r. d., resin dnct; m. r., nudul- 

 lary ray; Ir., trachrids of the medullary ray; p., parenchyma cells of the same; c tr.. comiimii trailieids or 

 wood libers. 

 fi-'f, I'lNl'S liLABKA. B, tangential section of a transverse resin dnct and ]iarts of three libers; /i./)., bordered ]>it; 

 other letters as above; C-G, tangential sections of medullary rays, of which /.' is made up of tracheids only, 

 while ]} is a " triple " ray. 

 H, Pints t.eda. Tangential sections of medullary rays in spring and summer wood. 

 Original nnignitied 500 times, illustrations about ''1'^. 

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