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 Algse." Botanical Gazette, III-IV : 68. 



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



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

 137, 181. 



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



5. "Fresh-water Algae. Synopsis of Discoveries aud Researches iu 

 1878." Torrey Bulletin, VI : 281. 



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



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



8. "American Fresh-water Alga?." 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 bom 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 age of seventeen, after the 



* isss. HALLIDAY JACKSON Poems. 



