XVIII 
PRKFACE 
Their acknowledgements are due to a number of persons who have; 
aided, but particularly to Mr. Henry Gannett, of W ashington, Mr. S. B. 
Scudder and Mr. B. P. Mann, of Cambridge, Mass., Dr. C. S. Minot, of 
Etoslindale, near Boston, Mr. .J. G. Lemmon, of Siena Valley, CaL, and 
Mr. John Marten of Carbondale, who have contributed to this report; to 
Mr. E. A. Schwarz, who has constantly assisted in office work, and to 
the late Albert J. Myer, who, as Chief Signal Officer, obligingly fur- 
nished meteorological data whenever required. 
