CONTENTS OF BIOGRAPHICAL SKETCH. 



Chapter I. 



Page. 

 Youth and manhood. — Early studies iu natural history vii 



Chapter II. 



Visit to Europe. — Meeting distinguished scientists in England, France, and 

 Switzerland xix 



Chapter III. 



Scientific researches. — Retirement from business. — Second visit to Europe xix 



Chapter IV. 



Examinations of collections of natural history. — Progress of science. — Descrip- 

 tions of distinguished scientists. — Departure for America xxvi 



Chapter V. 



Betam to Philadelphia. — Extracts of letters on scientific subjects. — Continued 



research. — Present occupations xlv 



V 



