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[[image: seal of The Academy of Natural Sciences of Philadelphia - INSTITUTED MDCCCXII INCORPORATED MDCCCXVII]] 1812 [[LEFT OF THE SEAL]] 1912 [[RIGHT OF THE SEAL]] The Academy of Natural Sciences of Philadelphia founded in the year eighteen hundred and twelve for the cultivation of the natural sciences, in March nineteen hundred and twelve will have completed one hundred years of active devotion to this purpose For the adequate celebration of its centenary anniversary the Academy will call in convention at its Hall the learned men and institutions of the world—its collaborators The Academy has the honor to invite W. H. Holmes to be present at this event which will take place at Philadelphia on Tuesday, Wednesday and Thursday the nineteenth, twentieth and twenty-first of March nineteen hundred and twelve