THE BOTANISTS OF PHILADELPHIA. 223 



of great value. The particular field of his investigations 

 had previously been but little worked, but his labors have 

 stimulated research in these very attractive by-paths of 

 science. He will long be remembered by those who were 

 his friends and correspondents for his kindliness of heart, 

 as well as for his conscientious care in the department of 

 science, to which he devoted the energies of his later years. 



Bibliography. 



1. "Fresh-water A\g^.''— Botanical Gazette, III-IV : 68. 



2. "Mosses of Pennsylvania." — Torrey Bulletin, VI: 36. 



3. "Fresh-water Algce," Nos. 1, 2, 3.— Torrey Bulletin, VI: 121, 

 137, 181. 



4. "A Nostoc, the Matrix of Scytonema." — Torrey Bulletin, VI : 217. 



5. " Fresh*-water Algse. Synopsis of Discoveries and Researches in 

 1878."— Torrey Bulletin, VI : 281. 



6. "Fresh-water Algse," No. 4.— Torrey Bulletin, VII : 43. 



7. "New American Desmids." — Torrey Bulletin, VII : 91. 



8. "American Fresh- water Algse." — Torrey Bulletin, VIII: 1, 37; 

 IX : 25 ; X : 13 ; XI : 13 ; XII : 1, 125. 



9. "Turner's New Desmids of the United States." — Torrey Bulletin, 

 XIII : 56. 



HALLIDAY JACKSON. 



Halliday Jackson,* son of Halliday and Jane (Hough) 

 Jackson, was born near Darby, Delaware County, Penn- 

 sylvania, December 27, 1817. His father was a prominent 

 member of the Society of Friends, and in early life spent 

 two years among the Seneca Indians, instructing them in 

 various industrial pursuits, and in 1830 published a work 

 on the " Civilization of the Indian Nations." 



Halliday, Jr., attended Friends' School at Darby, and 

 assisted on the farm. At the ao^e of seventeen, after the 



* 1888. Halliday Jackson— Poews, 



