T^he Ohio ^h^cituralist, 



PUBLISHED BY 



The Biotogkat Club of the Ohio State Uni'versity, 

 Volume II, JANUARY. 1902. No. 3. 



TABLE OF CONTENTS. 



ScHAFFNER— Self-Pruning of Woody Plants 171 



OsBORN— Mallophagan Records and Descriptions 175 



Kellerm AN— Minor Plant Notes, No. 4 1 79 



DuRY— Warblers Nesting Near Cincinnati 182 



Morse — Variations in the Water-Snake 183 



Morse — Myriopods from Vinton, Ohio 187 



Kellerman— Botanical Correspondence and Notes for Amateurs, II 188 



HiNE — Notes on Neuroptoid Insects 100 



Tyler - Meeting of the Biological Club 1 'J2 



THE SELF-PRUNING OF WOODY PLANTS. 



John H. Schaffner. 



Ill a former article* by Mr. Frederick J. Tyler and the writer, 

 the subject of the self-pruning of woody plants was discussed 

 in a general way, and a umiiber of notes were presented, giving 

 the facts observed up to the time of publication. During the 

 past year the writer has made further observations, which have 

 confirmed the views previously expressed and also added some 

 phenomena not mentioned in the former paper. The work was 

 carried on during the summer in northern Kansas, and continued 

 during the fall in central Ohio. 



The past summer was notable for the severe and long-continued 

 ■drouth, which extended over a large portion of the interior. This 

 cause may have had some effect on the cotton wood, Populus 

 deltoides Marsh., which was self-pruning very abundantly before 

 the 15th of July. Many of the branches cut off still retained 

 perfectly green leaves, while on some the leaves were withered or 

 yellow, and others were entirely defoliated before they fell to the 

 ground. The tree shown in the picture (Fig. i ) was standing 

 alone on the prairie. It was photographed on July 17, 1901, and 

 at this time had already cast a large number of branches. 



It was discovered that from the middle of July up to the time 

 of complete defoliation numerous branches with fresh, green 



*Schaffner, John H., and Tyler, Fred. J. Notes on the Self-Pruning of Trees. Ohio- 

 Nat., I 129-32, iqoi. 



