211 
himself was inclined to think so, as appears from his remark in 
the Flora Germanica (p. 341): “Varietates hic enumerate plures, 
ut mihi videtur, species constituunt, sed hucusque nondum satis obser- 
vate sunt.” 
Dr. Gray was inclined to connect our plant with the other 
European alpine variety, Camérica, but that has oblong-lanceolate 
leaves which are pilose on both sides. Tuos. C. PorTER. 
Francis Wolle, 
After a painful and protracted illness, Rev. Francis Wolle died 
at his home in Bethlehem, Pa., February roth. 
He was born at Jacobsburg, Northampton Co., Pa., December 
17,1817. His ancestors, for two generations, were conspicuously 
associated with the Moravian Society, and during his long and 
useful life he was always prominent in Moravian church and edu- 
cational affairs. Although a few of his earlier years were spent in 
business, he soon turned his attention to teaching as his life-work, 
and in 1857 he became vice principal of the celebrated Moravian 
Seminary for Young Ladies at Bethlehem, Pa. In 1861 he be- 
came principal of the institution, and conducted its affairs with 
marked ability until 1881, when the increasing infirmities of age 
necessitated his seeking rest. ; | 
From his childhood the study of natural history was his favorite 
pursuit, and after his retirement from active professional work, in 
1881, he devoted himself to it with more ardor than ever. He 
was especially known among botanists as an authority upon fresh- 
water algz and desmids. In 1884 he published his “ Desmids of 
the United States and list of Pediastrums.” The volume con- 
tained 1100 illustrations on 53 colored plates. This was followed 
in 1887 by two volumes on “ The Fresh-Water Alge of the United 
States, complemental to Desmids of the United States.” This 
work was illustrated by 117 colored plates, embracing 2300 figures. 
In 1891 he brought out a work upon the “ Diatomacee of the 
United States.” This contained 2 300 figures on 120 plates. All 
of the illustrations enumerated were photo-lithographs from India 
ink sketches made by the author. During 1892 there appeared a 
revised and enlarged edition of the “ Desmids of the United States.” 
His contributions to cryptogamic botany are recognized by 
