j&AYDIN AMONG- THE HILLS. 
Tine U. S. Geelogleal and «eo»mptit- 
ci«l Survey VV oris for 1875. 
For the past week Mr. Jas. T. Gardner, j 
geographer and first assistant of the survey, 
has been here superintending the equipment 
of seven field parties, Professor Hayden him- 
' self being detained by official business in 
W ashington till J uly . The rendezvous camp 
of the expedition has been Fisher’s ranch, 
on Clear creek, about four miles from Den- 
ver. On Monday morning this camp will be 
broken up and the seven divisions will march 
to their respective fields of labor. Mr. Wil 
son’s division will survey the southern part 
of the San Luis valley, the mountains on the 
east of it, and those ©n the west as far as the 
head of the Rio Grande river. His southern 
line is fifteen miles south of the boundary 
between Colorado and New Mexico. 
Mr. Wilson has already made a very accu- 
rate survey of the San Juan mining region, 
the map of which has just been published 
by Professor Hayden. 
Mr. A, D. Wilson is the topographer in 
| charge of the division. Dr, F. M. Eadlich is 
i the geologist, and Mr. F. Rhoda assistant to- 
pographer. 
Adjoining them on the west lies the work 
of Mr. Holmes’ division. Southward it ex- 
tends below the Colorado line, and west- 
ward into Utah some sixteen miles. The 
6,000 square miles in the extreme southwest- 
ern corner of Colorado, which this division 
will survey, is one of the most interesting in 
the territory, as being the seat of that an- 
cient civilizatian whose remarkable ruins 
were discovered and photographed last year 
by Mr. Jackson, of the Hayden survey. The 
work which he began so^well last season will 
be fully carried out this year. Mr. W. H. 
Holmes is the geologist in charge of the di- 
vision, Mr. G. B. Chittenden the topograph- 
er, and Mr. Bradigee assistant topographer, j 
North of Mr. Holmes’ work lies that of Mr. 
Henry Gannett’s division, Dr. A. C. Peal 
being the geologist and Mr. W. R. Atkinson 
assistant topographer. Their area includes 
the famed Uncumpahgre valley, the winter 
paradise of the Utes, and that remarkable 
plateau and cafioa country ou the Dolores 
and lower Grand river, nearly as far west as 
the main Colorado river. 
Mr. Gannett’s discoveries in 1874 of the 
cations 2,000 and 3,000 feet deep on the lower 
Gunnison river have excited much interest 
already. ^ , 
Mr. G. R. EUehier’s division will be en- 
gaged in completing unsurveyed portions of 
the mountains southwest of the Middle • 
Park and south and east of South Park. ; 
a work of these topographical and geo- 
gical parties rests upon and is bound to- 
gether by a primary triangulation, locating 
all of the principal peaks in latitude and 
longitude. This work is carried forward by 
the geographer of the survey, Mr. James T. 
Gardner, who this year will extend the great 
net- work of triangles over the areas surveyed 
by Mr. Gannett, Mr. Holmes and Mr. Wil- 
To accomplish this Mr. Gardner 
