ii INTRODUCTION. 



an expedition to certain portions of the country, to make collections and 

 investigations in their geology and fauna. Liberally offering his pecuni- 

 ary and personal aid, and encouraged by the Academy of Natural Sciences, 

 the Trustees of the Institute made the necessary provision, and the last 

 winter sent Prof. Heilprin on the proposed expedition in company \vith 

 Mr. Willcox. The results were valuable collections in zoology, and 

 especially in geology, together with important investigations and discov- 

 eries in the latter, an account of which is presented in the following report 

 by Prof. Heilprin. The well-observed facts of the report must greatly 

 modify the opinions which have been generally held in regard to the 

 geological construction of the peninsula of Florida ; and altogether Prof. 

 Heilprin's researches must be considered as an important contribution to 

 science. 



JOSEPH LEIDV, 



President of the Faculty. 



PHILADELPHIA, January, 1887. 



