igig] B ELY EA— SEQUOIA 473 



No attempt is made in the present article to draw any particular 

 or general conclusions. The whole is submitted as an observation 

 and description of a peculiar and interesting wood structure. It 

 is to be noted, however, that these structures were found and are 

 described in extremely rapidly grown wood tissue, and it is thought 

 that they are special adaptations of the elements for the transfer- 

 ence of material between the vertical and horizontal tissues, since 

 there is an entire absence of the usual intermediary tracheary 

 channels of communication. The origin and formation of these 

 latter elements have been fully described and established by 

 Thompson (8). 



This study was undertaken at the suggestion of Professor S. J. 

 Record, of the Yale School of Forestry, who also supplied a con- 

 siderable portion of the material and much kindly criticism, and 

 to whom the writer wishes to express his thanks and appreciation. 



New York State College of Forestry 

 Syracuse University 



LITERATURE CITED 



1. DeBary, a.. Comparative anatomy of the vegetative organs of phanerogams 



and ferns. 



2. Gordon, Marjorie, Ray tracheids in Sequoia sempervirens. New Phytol. 



11:1-7. 1912. 



3. GoTHAN, W., Review of Jeffrey's "The genus Sequoia," Just's Bot. Jahrb. 



31:848. 1903. 



4. HoLDEN, Ruth, Ray tracheids in the Coniferales. Box. Gaz. 53:56-64. 



1913- 



5. Jones, W. S., Ray tracheids in Sequoia sempervirens, and their pathological 



character. Quart. Jour. Forestry. 1914. 



6. Penhallow, D. p., The anatomy of the North American Coniferales (p. 88). 



7. Thompson, W. P., On the origin of ray tracheids in the Coniferae. Box. 



Gaz. 50: 101-116. 1910. 



8. , Ray tracheids in Abies. Box. Gaz. 53:331-338. 1912. 



