176 BOTANICAL GAZETTE [august 



seems 



Cryptomeria. In view of all the facts, it 



conifers, as a whole, are derived from the same ancestral stock, and 

 that the Abietineae are more like that stock than the Araucarineae. 



This investigation was carried on in the Phanerogamic Labora- 

 tories of Harvard University, and the sincerest thanks of the writer 

 are due to Professor E. C. Jeffrey for the lignites from Cliffwood. 

 for the photograph of the cone of Araucaria Bidwillii (fig. 7), and 

 for many helpful suggestions in the course of the work. 



Harvard University 



EXPLANATION OF PLATES XII-XV 



Fig. i. — A rauca rioxy I 'on sp.; radial section of mature wood; X125. 



Fig. 2. — Same, showing alternating and crowded pits; X250. 



Fig. 3. — Same, near the pith; toward the left, a tracheid with opposite 

 pits and bars of Sanio; toward the right, one with uniserial pits and bars; 

 X500. 



Fig. 4. — Same; at the left are the primary wood elements; next, a tracheid 

 with scattered pits; and then one with opposite pits and bars of Sanio; X 250. 



Fig. 5. — Same, more highly magnified; X500. 



Fig. 6. — Same, showing opposite, triseriate, and alternating pits, in every 

 case separated by bars of Sanio; X500. 



Fig. 7. — Araucaria Bidwillii; radial section of cone axis in proximity to 

 the protoxylem. showing presence of bars of Sanio; X500. 



Fig. 8. — Pinus protoscleropitys; radial section of mature wood showing 

 opposite pits and bars of Sanio; X500. 



Fig. 9. — GeinUzia Reichcnbachi; transverse section of stem, showing 

 sclerites in pith; X15. 



Fig. 10.— Same; longitudinal section of pith ; X15. 



Fig. 11. — Twig from Cliffwood; transverse section of pith, including nest 

 of stone cells; X15. 



Fig. 12. — Same; the outer bark contains clusters of large stone cells, 

 below which is the inner bark, consisting of alternate layers of hard and »ii 

 bast; X40. 



Fig. 13. — Same; longitudinal section of bark; X40. 



Fig. 14. — Same; longitudinal section of pith, showing nests of stone cell-: 



X15. 



Fig. 15. — Brachyoxylon sp. including row of traumatic resin canals; X4°- 



Fig. 16.-- -Same; longitudinal section; X40. 



Fig. 17. — Brachyoxylon sp.; transverse section of normal mature wood; 

 X90. 



