tort] SINNOTT—FOLIAR BUNDLE 271 
one of which has progressed toward the coniferous type, and is 
represented by the Cordaitales and the modern Coniferales, and the 
other of which has produced the cycadean type, as represented by 
the Bennettitales and the modern Cycadales. 
The writer is under much obligation to the authorities of the 
Royal Botanic Gardens at Kew and of the Botanic Garden of 
Harvard University for material. He also wishes to express his 
thanks to Professor E. C. Jerrrey for advice during the course 
of the work. 
This investigation was carried on in the Phanerogamic Labora- 
tories of Harvard University. 
Harvarp University 
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é. ———,, Studies in fossil botany. Part II. London. 1909. 
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