NOTES. 383 
Prof. F. V. Hayden, U. S. Geologist, writes us, May 30th, from 
Cheyenne, Wyoming: “We start from this place to-day with 
twenty-eight persons and five freight cars loaded, and hope to 
camp at Ogden on the evening of June Ist. We start north from 
that point to Fort Ellis, Montana, and examine the Yellowstone. 
A few weeks ago the “Explorador” made her trial trip on the 
Thames. She is a little iron craft drawing thirty inches, and was 
built for the Robinson Navigation Company of New York. She 
is designed for a most interesting expedition which cannot fail to 
increase the commerce of the west of South America and develop 
its natural history. Ascending the Amazon, the “ Explorador” 
will be rolled around the rapids of the Madeira, and will then 
penetrate far into the interior of Bolivia by the Manu-tata and 
into the rich region of Matto Grosso by the Itenez. Peru is 
busily exploring its oriental side by the noble Ucayali. The 
“Tambo” has been up over eight hundred miles, nearly reaching 
the fort of Chanchamayo on the tributary Rio Tambo, only three 
days from Lima. 
The Troy Scientific Association, accompanied by the Albany 
Institute and the Dana Societies of Troy and Albany, held a mem- 
orable field meeting on the Helderberg Mountains on the seven- 
teenth of June, visiting the Indian Ladder, Tory House, Rock 
Mine, Thompson Lake, ete. There are few more really enjoyable 
spots in America, and none more suited for a scientific field-day, 
than this comparatively unknown locality, which is reached via 
Guilderland Station on the Albany and Susquehanna Railroad. 
Among the signs of the scientific life of the present day one of 
the most encouraging, is the increasing frequency and enthusiasm 
of these delightful occasions of scientific study, intercourse and 
recreation called Field Meetings. A day upon the mountains is 
worth a week among the books. 
Prof. Marsh of Yale College, with twelve other gentlemen, has 
started for the Rocky Mountains and Pacific Coast. He will be 
absent until winter, and will continue his investigations of the 
Tertiary and Cretaceous formations which his explorations last 
year proved to be very productive in new species of vertebrates. 
Mr. Albert H. Tuttle has been appointed instructor in the use 
of the microscope at Harvard University. 
