PROCEEDINGS. 
491 
yet published], and by C. K. Wead on Labels on objects in 
museums. [Not published.] 
Mr. C. D. Walcott read a paper entitled A geological trip to 
Newfoundland. [Published, with the title Lower Cambrian ter- 
rane in the Atlantic province, in Proceedings of the Washington 
Academy of Sciences, 1900, February 14, vol. i, pp. 301-339.] 
Discussed by Mr. Tittmann and the author. 
Mr. C. K. Wead read a paper entitled Some Arab musical 
scales. [An abstract was published in the Proceedings of the 
American Association for the Advancement of Science, 1899, 
vol. xlviii, p. 96 ; also in Science, 1899, November 24, new series, 
vol. x, no. 256, p. 777.] 
506th Meeting. November 11, 1899. 
President Tittmann in the chair. 
Thirty-five members and guests present. 
Informal communications were made as follows: 
By Mr. Artemas Martin, an illustration of the extraction ot 
the fourth root by successive subtractions, being supplementary 
to his communication at the last meeting. [Not yet published.] 
By Mr. Bigelow, who stated that additional information had 
been obtained as to the percentage of cloudiness along the path 
of the total eclipse of May 28, 1900. 
By Mr. Marcus Baker, on the recent Anglo-Venezuelan 
boundary arbitration held in Paris. [Published in the National 
Geographic Magazine, April, 1900, vol. xi, no. 4, pp. 129-144.] 
Mr. Littlehales called attention to a defect in the boundary 
description contained in the recent treaty respecting the Phil¬ 
ippine islands. 
Mr. R. H. Strother read a paper entitled Some observations 
on a problem in dynamics. This was illustrated by a model 
and by lantern slides. The paper was devoted to an explana¬ 
tion of the method by which a cat was able to turn over in the 
69—Bull. Phil. Soc., Wash., Vol. 13, 
