THE BOTANISTS OF PHILADELPHIA. 241 



to be taken on field excursions, the great herbarium and 

 other collections, require more than twenty-four hours a 

 day. Dr. Porter's aid is also sought constantly in preparing 

 publications of permanent importance. Our comrade of 

 Torrey, Gray, Leidy, Schaff, has stores of truth and wisdom 

 which mankind would not willingly let die. He ought to 

 publish freely. He needs an assistant, or an associate to 

 divide the field." 



Dr. Porter, although now seventy-seven years old, is 

 still hale and active. May he long be spared to the college 

 whose interests he has so much at heart. 



1. '' List of Plants collected by Mr. Thaddeus A. Culbertson on an 

 Expedition to the Mauvaises Terres and Upper Missouri, in 1850." — Fifth 

 Annual Report Smithsonian Institution, 1850. 



2. "Catalogue of Plants collected during the Expedition of F. V. 

 Hayden to the Headwaters of the Yellowstone River, in the Summer 

 of 1871." — United States Geological and Geographical Survey of Montana and 

 Adjacent Territories. Washington, 1871, pp. 477-498. 



3. "Catalogue of Plants collected in Wyoming and Colorado, by 

 F. V. Hayden and B. H. Smith." — United States Geological Survey, Wash- 

 ington, 1872. 



4. "Synopsis of the Flora of Colorado (in conjunction with J. M. 

 Coulter)." — United States Geological and Geographical Survey, Miscellaneous 

 Public, No. 4, pp. 180, pamphlet, Washington, 1874. 



5. "Orders Polemoniacese, Borraginacese, Scrophulariacese, Labiatae 

 and Polygonaceae in Botany of Wheeler Survey." — By J. T. Rothrock 

 Vol. 6. Washington, 1878. 



6. " Enumeration of the Indigenous and Naturalized Plants of Lan- 

 caster County, Pennsylvania." — Momhert'' s Authentic History, Lancaster, 1869. 



7. ' ' Sketch of the Botany of Pennsylvania. ' ' Walling and Gray^s 

 Topographical Atlas, Philadelphia, 1872. 



8. "Sketch of the Botany of the United States." — Gray^s Atlas, 

 Philadelphia, 1873. 



9. "A List of the Carices of Pennsylvania." — Proceedings Academy 

 Natural Sciences, Philadelphia, 1887. 



