Respecting the column headed References the followmg abbreviations were 

 used : — 



s. o. 



S. Coll. 



Sm. Con. to. KnoTvl. 



for Smithsonian system of observations. 



for Smithsonian collection in general. 



for Smithsonian Contributions to Knowledge. 



P. O. and S. I. Vol, I, for Patent Office and Smithsonian Institution systems. 



Ar. Met. Regs. for Army Meteorological Registers. 



MS. from S. G. O. for Manuscript from Surgeon-General's Office. 



Am. Aim for American Almanac. 



Agl. Rep. for Agricultural Report. 



Reg. Rep. for Regents' Report. 



N. Y. Univ. Syst. for New York University System. 



And various others whose meaning is sufficiently apparent 



( xvi ) 



