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Mycologia 



the greater portion of them were subsequently rearranged and 

 mounted has been already described and illustrated by the writers 

 (41, pp. 6-1 1, pis. 3, 4, 5, 6). 



When the former paper was prepared it was apparent that the 

 greater part of the work of rearranging the specimens was done 

 by Dr. Ezra Michener. No evidence could, however, be ob- 

 tained as to the date at which this work was done. Nor was it 

 clear whether the specimens were rearranged and mounted before 

 or after the studies of Berkeley and Curtis. Realizing the im- 

 portance of this information the writers have endeavored to ob- 

 tain further data by correspondence with various people in this 

 country and in England, and recently (December, 1916) have 

 made a thorough search for possible manuscripts which might 

 throw light on the question. 



Fortunately, letters preserved in the files of the Academy of 

 Natural Sciences at Philadelphia, which through the courtesy of 

 Doctor Nolan the writers were permitted to examine, enabled 

 them to settle these doubtful points. The early correspondence 

 of the Academy is rather fragmentary, due to the fact that until 

 about twenty years ago there were no salaried officers connected 

 with the institution to whom the care of such matters could be 

 entrusted. About eighteen years ago Doctor Nolan caused such 

 letters as had by chance been preserved to be filed chronologically, 

 and in these files letters from both Curtis and Michener were 

 found. In addition, Miss Elsie M. Wakefield, of the Crypto- 

 gamic Herbarium, Royal Botanic Garden, Kew, has generously 

 sent the writers such information as could be obtained from the 

 letters of Curtis to Berkeley, preserved at the British Museum. 



From these sources the writers have been able to learn the 

 dates at which Curtis and Michener worked on the Schweinitz 

 herbarium and also much about the work of each. This informa- 

 tion is given chronologically below. According to Miss Wake- 

 field: 



"The correspondence of Berkeley and Curtis began about 

 1845 or 1846, and from the replies given in several of Curtis' 

 letters it would appear that Berkeley made inquiries as to the 

 whereabouts and preservation of Schweinitz's collection, the 

 possibility of obtaining duplicates, etc., and urged Curtis to spend 

 some time studying them. 



