THE FLORA OF NORTH AMERICA. 29 
and has been since 1871 the geologist of the Danish explorations 
of Greenland. He received the honorary degree of Ph. D. in 1894. 
He made two expeditions to Greenland. one in 1876 to Juliane- 
haab, and another in 1878—’80 to North Greenland. On the first 
Docent Kornerup was the botanist; during the second Steenstrup 
made the botanical collections himself. 
Gustav Frederik Holm was born in Copenhagen in 1849 and be- 
came captain in the marine in 1885, He partook in the expedi- 
tion under Steenstrup in 1876. He led an expedition to South 
Greenland in 1880—’81, and another to East Greenland in 1883 
—’85. He published, 
Den Danske Konbaadsexpeditionen til Grénland, 1883—’85. 
C. Petersen*, Ph. Cand., was the botanist of the expedition to 
South Greenland in 1880 under Caprain G. F. Hot. 
Jens Arnold Diderich Jensen was born at Flensborg the 24th of 
July, 1849, became captain in the marine in 1886, bureau-chief of 
the marine department in 1887, and retired in 1892. He made 
several journeys to Greenland: In 1877 to South Greenland, in 
1878 to Godthaab and Fredrikshaab, in 1879, 1884 and 1885 
to Holstenborg, Suckertoppen, and Godthaab. On the second of 
these journeys he was accompanied by Kornerup, and on the last 
by Dr. Séren Hansen, who acted as botanists. On the others he 
collected some plants himself. 
N. Sylow, Ph. Cand., was the botanist of the expedition to 
North Greenland in 1879—’80 under Lisut, R. Hammer, and of 
that to South Greenland in 1883 under Caprain Hot. 
P. Eberlin and N. Knutson, Ph.Cand., werethe botanists of the 
expedition of 1883—’85, under Caprain HOLM. 
Carl Hartvig Ryder was born the the 12th of September, 1858, 
at Copenhagen, became lieutenant in the marine in 1879, and 
captain in 1897. He partook in Poulsen’s expedition to Godt- 
haab and Suckertoppen in 1885, made one to Upernavik in 1886, 
and another to the east coast of Greenland in 1891—’92, during 
which he himself made extensive botanical collections. 
Johannes Eugenius Buelow Warming (See West Indies, page 48), 
and 
f several of the fol- 
* I have not been able to give any biographical sketch either of him or 0 
collectors, as those volames of M om Grénland in which the account of their work 
published, are not found in the libraries of the City of New York. 
