396 THE BOTANISTS OF PHILADELPHIA. 



botanical thought abroad. Two weeks were spent amidst 

 the alpine flora of the Bernese Oberland, the Mount 

 Blanc range and the neighborhood of Zermatt, within sight 

 of Monte Rosa and the Matterhorn. A number of botanic 

 gardens were visited : Dublin, Edinburgh, Cambridge, Kew, 

 Royal Society, Amsterdam, Bonn, Berlin, Dresden, Vienna, 

 Munich, Zurich, Berne, Paris and Oxford. Many sugges- 

 tions came to him in comparing the American botanical 

 institutes (most of which he has personally visited) with 

 those of England and of the continent. Much inspiration 

 was derived from this trip abroad. An inspection of the 

 museums suggested many lines of work in connection 

 with his ethno-botanical studies. 



Bibliography. 



1. "A Few Pennsylvania Forestry Statistics." — Forest Leaves, II: 

 37, March, April, 1889. 



2. '' The Wissahickon^yoods.''— Garden and Forest, lY: 129 (1891). 



3. ''Plants for the Seashore." — Garden and Forest, V: 45, January 

 27, 1892. 



4. "An Abnormal Development of the Inflorescence of Dionoea." — 

 Contrib. Bot. Lab., University of Pennsylvania, I: 45. 



5. ''Maize: A Botanical and Economic Study. " — Contrib. Bot. Lab. 

 University of Pennsylvania, 1 : 75, 202. 



6. " A Philadelphia Court of Honor." — Philadelphia Ledger, Decem- 

 ber 7, 1893. 



7. ' ' An Additional Poisonous Plant. ' ' — Botanical Gazette, XIX : 159, 

 April, 1894, Garden and Forest, VII : 170. 



8. "Geographical Biolog;y.''— Education, XIV : 513, May, 1894. 



9. "James Logan, an Early Contributor to the Doctrine of Sex in 

 Flants.'^— Botanical Gazette, XIX : 307, August, 1894. 



10. "Plant Forms on Mexican and Central American Tablets." 

 American Antiquarian, XVI : 299, September, 1894. 



11. "The Origin of Our Vernal Flora.''— Science, N. S., I: 92, 

 January 25, 1895. 



