CHARLES PICKERING 153 



1876 a more bulky one On Plants and Animals in 

 Their Wild State. These writings, and some 

 contributions to scientific journals, notably to the 

 Smithsonian Contributions to Knowledge, con- 

 stituted his no mean help to the study of natural 

 science ; but he had been long and lovingly work- 

 ing on a book yet unfinished when he died, a 

 book edited afterwards by his wife, Sarah S. 

 Pickering, and appearing in 1879, entitled Chro- 

 nological History of Plants, or Man's Record of 

 His Own Existence. 



Professor Harshberger, from whom I have 

 largely quoted, says he was singularly retiring 

 and reticent, dry in ordinary intercourse, but to 

 those who knew him well, communicative and 

 genial. 



The Botanists of Philadelphia. J. W. Harshberger. 1889. 

 Proc. Acad. Nat. Sc., Phila., 1878. W. S. W. Ruschenberger. 



