vi PRELIMINARY REMARKS. 
ascertained. Some of these are mentioned below, with the ab- 
breviations I have used. 
Prof. C. B. Adams, of Amherst, Mass. Ad. 
Prof. L. Agassiz, of Cambridge, Mass. Ag. 
Capt. N. Atwood, of Provincetown, Mass. Atw. 
U.S. Coast Survey, Prof. A. D. Bache, Sup. C. S. 
Mr. 'T. C. Haskell, of Lynn, Mass. Hask. 
Dr. J. B. Holder, of Lynn, Mass. Hold. 
Mr. James P. Low, of Charlestown, Mass. Low. 
Dr. J. W. Mighels, formerly of Portland, Me. Migh. 
Mr. Robert F. Parker, of Nantucket. Park. 
Mr. Temple Prime, of New York. Prime. 
Dr. J. Ray, of Providence, R. I. Ray. 
Gen. J. G. Totten, U.S. A. Tot. 
Mr. J. True, of Salem, Mass. True. 
Mr. 8. Tufts, of Lynn, Mass. Tufts. 
Capt. Walden, of Cutter, ‘* Hamilton.” Wald. 
Dr. Henry Wheatland, of Salem, Mass. Wh. 
The Author. W.S. 
