IV CONTENTS. 



PAGE. 



Minutes of the 196th Meeting, March 19th, 1881. — J. W. Poweil on the 



Limitations to the use of some Anthropologic Data f __ 134 



Minutes of the 197th Meeting, April 2d, 1881. — Resolutions Commemora- 

 tive of the late Dr. George A. Otis, U. S. A. A. B. Johnson on the 

 Histoiy of the Light-House Establishment of the United States. E. 

 B. Elliott on A Fixed Legal Ratio of the Values of Gold and Silver. 134 



Minutes of the 198th Meeting, April 16th, 1881. — Alexander Graham Bell 

 on the Spectrophone. G. Brown Goode on the Sword Fish and its 

 Allies 142 



Minutes of the 199th Meeting, April 30th, 1881.— W. H. Dall on Recent 

 Discoveries in Alaska north of Behring Strait. J. S. Billings on Mor- 

 tality Statistics of the Tenth Census 163 



Minutes of the 200th Meeting, May 14th, 1S81. — S. C. Busey on the Rela- 

 tion of Meteorological Conditions to the Summer Diarrhceal Diseases. 164 



Minutes of the 201st Meeting, May 28th, 1881. — D. P. Todd on the Solar 

 Parallax as derived from the American Photographs of the Transit of 

 Venus. G. K. Gilbert on the Origin of the Topographic Features of 

 Lake Shores 168 



Minutes of the 202d Meeting, June nth, 1881. — J. J. Woodward, A Bio- 

 graphical Sketch of the late Surgeon George A. Otis, U. S. Army, 

 with a List of his Publications. Alexander Graham Bell on a Modifica- 

 tion of Wheatstone's Microphone and its Applicability to Radiophonic 

 Re- searches. J. M. Toner on Earth Tremors at Niagara 170 



Index 187 



