ACADEMY OF NATURAL SCIENCES. 367 



While another set of such observations may produce slightly different results, 

 I think they will not differ one hundred feet from the estimate here given. 



Dr. Gibbons exhibited a specimen of Euphorbia lathyris, and 

 remarked upon its distinguishing characters. 



Regular Meeting, October 7th, 1867. 



Dr. J. G. Cooper in the chair. 



Twelve members present. 



Donation to the Cabinet: Salt from a manufactory on the 

 Columbia River, near Portland, Oregon, by Mr. Victor. 



Regular Meeting, October 21st, 1867. 

 President in the Chair. 



Twenty-three members present. 



Mr. J. G. Burt was elected a Resident, and Professor W. D. 

 Alexander, of Honolulu, Hawaiian Islands, a Corresponding Mem- 

 ber. 



Donation to the Cabinet : A large number of Californian plants, 

 collected and presented by Messrs. Bolander and Kellogg. 



Donations to the Library : Humboldt and Bonpland's Botanical 

 Observations in South America, four vols. 8vo., Paris, 1822, by 

 Mr. Bolander. 



Professor Whitney read extracts from letters recently received 

 from Mr. Dall, dated at " St. Michael's, Russian America, August 

 14th, 1867," and addressed to the Academy and to himself. The 

 following are some extracts from these letters : 



" I have traveled on snow shoes, with the thermometer from 8° to 40° below 

 zero, about four hundred miles. I have paddled in open canoes up stream six 

 hundred and fifty miles, and down 1,300 miles. I have obtained 4,550 speci- 

 mens, including a set of the rocks from Fort Youkon to the sea, sufficient to 

 determine the geological formations for 1,300 miles. The only fossiliferous 



