45 



effect of the wind on transpiration, evaporation, and related 

 problems. Considerable time was spent in experiments on cut 

 twigs, phytometers, and Livingston atmometers, with the usual 

 battery of Weather Bureau instruments. A new type of col- 

 lodion-coated atmometer, devised by Professor Livingston, was 

 tried out at Montauk, and the results sent to the Laboratory of 

 Plant Physiology at the Johns Hopkins University, where, with 

 others, they formed a basis for revising the coefficients which 

 Professor Livingston issues with these instruments. 



The results of the study of transpiration as affected by wind, 

 as well as much data on evaporation with relation to wind and 

 fog, are being incorporated in the second part of "The Vegetation 

 of Long Island," on forests, which will be ready for the printer 

 sometime during 1925. 



Much work on the "Flora of Long Island" has been accom- 

 plished, particularly the checking of old records, the specimens 

 of the Mulford, Hamilton, and Gershoy herbaria, as well as the 

 very valuable and discriminating collections of William C. 

 Ferguson, Esq. of Hempstead, who has cooperated with us 

 most generously. 



There are two lines of work which I wish to push actively 

 the coming season. 



1. Experimental and field studies of Long Island vegetation — 



particularly problems to do with succession in the oak- 

 hickory and pitch pine forests. 



2. Collect, wherever possible, for the "Flora of Long Island." 



This record is already more complete than any other, but 

 it is not yet sufficiently complete to warrant publication. 

 I am anxious to gather all the collections possible, within 

 the next two or three years. 



Systematic Botany 



The Classification of Dicotyledons . By Alfred Gundersen. 



During 1924 I have continued to make observations, drawings 



and notes on the structure of flowers of dicotyledons. Material 



is being accumulated for a general outline relating to families 



of dicotyledons, considering their leading characters in con- 



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