416 Scientific Intelligence. 
The largest individual wells have been opened in the Venango 
district, but the average yield has been greatest in the Brad- 
ord; some of the former having produced 2,000 to 3,000 barrels 
of oil per: day, while the largest of the latter have not exceeded 
as many hundred. 
8. Giesecke’s Mineralogiske Rejse i Grinland, ved F. Jonn- 
strup; med et Tilleg om de Grénlandske stednavnes Retskriv- 
ning og Etymologi af Dr. H. Rink. 372 pp. 8vo, with 3 plates. 
Copenhagen, 1878.—This work gives the diary of Carl Ludvig 
Giesecke during his travels in Western Greenland from 1806 
through 1813, or about eight years. Giesecke was the first to 
a 
ethnography of Greenland. Among the new minerals discovered 
by him are eudialyte, arfvedsonite, allanite, gieseckite, fergusonite, 
sapphirine; he also described the method of occurrence of cryo- 
lite. During his life he published but little, and it is only now 
Ww ent 
. the following facts are 
extracted, The continental ice of Southern Greenlan s been 
hitherto an almost absolutely unknown region, ly ex- 
the expedition since at the farthest point of the journey inland, 
he reached a series of isolated rocky summits, emerging like 
islands above the continental ice (they are called Jensen’s * ‘Nuna- 
takker). From these peaks, 5000 feet above the sea level, and 
