PLATE XXIV.— RADIAL AND TANGENTIAL SECTIONS. 



A and Jl, Pints t.eda. Kailial .sectious; m. »-., moilullary rays ; ii:, tracheida; p., parenchyma of the rays; 



simple pit; b. p., bordered pit; c. tr., commou tracheids. 

 C-E, tangeutial sections. 



C, Pixus PALUSTltls. Left-hand part in springwood, right-hand ]>ortion in 

 D-E, PiNUS ECiiiNATA. 1), Section in springwood; «-c, medullary rays; », 

 c, a "tripple" ray; rf, bordered pit showing the membrane in place. 

 pit, other letters as in A and II. 

 Magniiication of originals, ^f; of illustrations: A and B, -{'i; C-E, '^'P 

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