. 
380 BOTANICAL GAZETTE [NOVEMBER 
Fic. 6.—Quercus densiflora: tangential section of the traumatic wood, 
showing aggregation of uniseriate and biseriate rays; 120. 
PLATE XII 
Fic. 7.—Quercus alba: tangential section of the pie adult wood, 
showing highly organized broad homogeneous ray; X12 
Fic. 8.—Quercus alba: tangential section of the eat wood, showing 
the aggregation and fusion of triseriate and biseriate rays; these rays have been 
produced by the enlargement or growth in diameter of uniseriate rays; 120. 
Fic. 9.—Quercus alba: transverse section of the normal adult wood, show- 
ing the highly organized type of ray; 120 
Fic. 10.—Quercus alba: transverse section of the aes pails show- 
ing aggregation of uniseriate, biseriate, and triseriate rays; 
11.—Alnus sp.: transverse section of very slightly Eioel wood; 
compounding rays are absent from the lower half of the section; starting 
abruptly from a line of slightly injured tissue which crosses the middle of the 
section, numerous rays extend outward to the exterior of the stem; 49. 
1G. 12.—Quercus densiflora: transverse section of very slightly injured 
wood; the lower half of the section possesses only uniseriate rays, but start- 
ing from the middle of the section a compounding ray has originated from a 
slight injury to the wood; X60 
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