Scientific News. 667 
SCIENTIFIC NEWS. 
—Dr. Roland Duer Irving, Professor of Geology and Miner- 
alogy at the University of Wisconsin, died at Madison on the 30th 
of May last. Professor Irving was in comparatively good health 
on the preceding Saturday, having taken a boat ride with his 
family on one of the lakes surrounding Madison. On Sunday 
morning about eight o’clock he was stricken with paralysis. Durin 
the day he was conscious, but could not be made to realize his 
serious condition. On Monday he was only half conscious, and from 
that time gradually passed into a deep stupor, which faded into 
death on Wednesday morning. Dr. Irving was the chief in charge 
of the Lake Superior Division of the United States Geological 
Survey. His most important work was the establishment of a 
great break in the geological continuity between the Laurentian 
and the Huronian systems, and (together with President Chamber- 
lin) the erection of a new system, the Keweenawan, between the 
Huronian and the Cambrian. At the time of his death he was 
engaged with Professor C. R. Van Hise in the preparation of a 
monograph on the iron-bearing rocks of the Penokee-Gogebic 
region. Professor Irving was a native of Staten Island, New 
York, and was a nephew of Washington Irving. He leaves a wife 
and three children, 
of the AMERICAN Naturaist for a time. Professor Lewis was an 
fathusiastic student, and a man of most amiable character. His 
