APPENDIX. 



299 



ADDITIONAL NOTES continued. 



In the oaks, two groups can be readily distinguished by the manner in 

 which the pores are distributed in the summer wood. (Fig. 133.) In the 

 white oaks the pores are very fine and numerous and crowded in the outer 

 part of the summer wood, while in the black or red oaks the pores are 

 larger, few in number, and mostly isolated. The live oaks, as far as struc- 

 ture is concerned, belong to the black oaks, but are much less porous, and 

 are exceedingly heavy and hard. 



Fig-. 133. Wood of Red Oak. (For white oak 

 see fig". 129, p. 291.) 



100 H)OO c 



"i n ( i 



Fig-. 134. Wood of Chestnut. 



