1898.] NATURAL SCIENCES OF PHILADELPHIA. 15 



seeds were sent to Mr. William Hamilton, and the " Hortus Siccus 

 referred to Dr. Barton to examine and report." A full examina- 

 tion of the collection, revealed this package also. It contained the 

 plants collected in 1804 between St. Louis and Fort Mandan. 

 Pursh had evidently been over this, as in many instances the labels 

 were similar to those in the other package ; but a number had the 

 original memoranda in the hand-writing of Captain Lewis. These 

 were written wholly across the sheet containing the specimens. 

 Pursh had evidently copied them in order to have small compact 

 labels for the specimens, and while doing so, had occasionally added 

 the more technical botanical points already adverted to. He 

 evidently studied these collections before starting to Europe with 

 them, leaving the duplicates, where there were any, and those which 

 were too imperfect to be easily recognized. A comparison of 

 Lewis's own labels and Pursh's copies shows that the latter were 

 not always strictly copied — differences can be seen in the compari- 

 sons made in the Catalogue. Pursh's notes were probably made 

 from Lewis's original memoranda carried away with the speci- 

 mens, and are, therefore the more likely to be the exact statements 

 of the collectors, than the copies left with these. 



After determining the plants in the collection as far as I could, 

 considering the fragmentary condition of many of them, I handed 

 them over for correction to Dr. B. L. Robinson of the Gray 

 Herbarium. With their return, I received the following letter. 



"The identification of the Lewis and Clark plants has now been 

 completed and I am happy to be able to send you a list, as Mr. 

 Greenman and I understand them. We have worked over the 

 plants together for greater accuracy, discussing almost every 

 specimen. In any reference to work done here upon the plants, 

 kindly associate the name of Mr. Greenman with my own. The 

 plan of the list is to show in double columns : — 1st, what the plant 

 actually is, according to present ideas of classification, then the 

 actual locality and date which the accompanying label bears; 

 2nd, in the other column, is shown what Pursh appears to have 

 called the plant in his Flora, provided he mentioned it clearly ; also 

 the locality and date which he there ascribed to it. I think that 

 the advantage of this parallel column presentation of this impor- 

 tant collection will be readily evident to you. 



Perhaps the most interesting find in the collection is the unlabelled 

 Clematis. Now as this is the only Clematis represented, and the only 



