﻿Botantcal 



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Vol. XXXV. No. 2 



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Issued February 24, J 903 



CONTENTS 



CHEMICAL STIMULATION AND THE EVOLUTION OF CARBON DIOXID. Contri- 

 butions FROM THE Hull Botanical Laboratory. XLIV (with two figures). Edxvin 



Bingham Copeland - - - - - - -- 



THE GENUS CRATAEGUS IN NE\YCASTLE COUNTY, DELAWARE. Charles S. 



Sargent ----._-_.-- 



THE RAVENELL\S OFTHE UNITED STATES AND MEXICO (with plates 11 and III). 



William H, Lofig, Jr. -.-..--.- 



BRIEFER ARTICLES. 



. Chalazogamy IN Carya olivaeformis. Frederick H. Billings, - - - - 



Selected Notes. W, C. Coker, - - - 



CURRENT LITERATURE, 



81 



99 



III 



134 

 135 



BOOK REVIEWS 



Dune Work in Germany. 

 minor notices 



notes for students 



139 



French Forests 



NEIVS 



■ ^ 



140 

 140 



150 



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