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. Jane paces an early New York Botanist, by Anna Murray 
Vai ; 
. Studies in North American Peronosporales—I. The Genus — 
. Costa Rican Orchids — L., by George Valentine Nash. 
. An Occurrence of Glands in the Embryo of Zea oe ” c 
TABLE: OF CONTENTS. 
Astragalus and its Segregates as represented in Colorado, by 
Per Axel Rydberg. | 
The Delta of the Rio Colorado, by Daniel Trembly Mac 
Dougal. 
The Incapacity of the Date Endosperm for Self-digestion, 
by Raymond H. Pond 
Affinities of certain cretaceous plant remains commonly re- 
referred to the genera Dammara and Brachyphyllum, by 
Arthur Hollick and Edward C. Jeffrey. 
Heredity and the Origin of Species, by Daniel Trembly 
MacDougal. 
Studies in Etiolation, by Augustine Dawson Selby. 
Studies on the Rocky Mountain Flora — XVI., by Per Axel 
Rydberg. 
The Hemlock Grove on the Banks of the Bronx River and 
what it Signifies, by N. L. Britton. 
. The Pollen-tube in some of the Cucurbitaceae, by Joseph 
Edward Kirkwood. 
Systematic Palaeontology of the Pleistocene Deposits of 
Maryland: Pteridophyta and Spermatophyta, by Arthur 
Hollick. 
. Two New. Coralline Algae from Culebra, Porto Rico, by M. 
Foslie and M. A. Howe. 
Studies on the Rocky Mountain Flora — XVII., by Per Axel 
Rydberg. 
Two mee Species of Aytonia from Jamaica, by Carding: 3 
Coventry Haynes. 
Albugo, by Guy West Wilson. 
Stuart Gager. 
