June, 1915.] 



Eay Pits of Conifers. 



549 



TABLE I. 



Measurement of the ray pits of Larix laricina through one annual ring. 



TABLE XL 



Measurement of ray pits of Larix occidentalis through one annual ring 

 of 16 tracheids; 10-16, late wood; 15-16, so compressed that measurements 

 were approximated. 



