all white oaks except one, and that an old rough barked red 

 oak. With the rain running off themselves in streams, the 

 members of the party investigated closely and saw that drops 

 of water, gathering on the vertical, slightly concave plates of 

 bark on the white oaks, condensed at the lower tip of the plates, 

 which bend outward slightly and dropped oft". Where they 

 struck the butt of the tree two or three feet below, a mass of 

 foam was gathered, constantly renewed as the bubbles burst, 

 by the drops falling from above. 



The bubbles had what appeared to be a slightly soapy con- 

 sistency. Was this effect purely mechanical, or was there some 

 soapiness in the water dripping from the oak bark scales? Could 

 this water be a mild solution of tannic acid and would this be 

 soapy enough to form bubbles when aerated in descent and 

 striking on the bark below? These frothy patches were not 

 seen on smooth barked trees, those with sweet sap, like maples 

 and black birches; the only other species on which they were 

 observed was a rough barked red oak. It was somewhat of an 

 offset to the drenching everyone suffered, to speculate on the 

 cause of these patches of bubbles. 



Raymond H. Torrey 



PROCEEDINGS OF THE CLUB 

 Meeting of March 13, 1928 



This meeting was held at the American Museum of Natural 

 History, and was called to order at 8:25 p.m. by President 

 Denslow. The following were unanimously elected to member- 

 ship in the Club: 



Dr. Charles W. Ballard, College of Pharmacy of Columbia 

 University, 115 W. 68th St., New York City. 



Miss Fanchon Hart, College of Pharmacy, Columbia Uni- 

 versity, 115 W. 68th St., New York City. 



Mr. Victor Lewitus, College of Pharmacy, Columbia Uni- 

 versity, 115 W. 68th St., New York City. 



Mr. Lorens F. Logan, 115 Broadway, New York City. 



Dr. William S. Thomas, 1175 Park Ave., New York City. 



Miss Helen A. Timmerman, College of Pharmacy, Columbia 

 University, 115 W. 68th St., New York City. 



The resignation of Mr. Ludlow Griscom was accepted with 

 regret. 



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