EXTRACTS FROM DR. HAYDEN T S REPORT FOR 1378 
RELATING TO THE FIELD WORK OF W.H.HOLMES FOR THAT YEAR. 
"The most notable feature of the work of Mr. Holmes for 
1878 was his connection with the Survey of the Yellowstone Park 
on which he acted as geologist and made an extended Repcr t on 
the Geology of the Park which is included in the 1878 report of 
the Survey of the Territories.” It occupies pages 1 to 57 
of that report. 
"To the division of the Survey in charge of Mr. Henry 
Gannett was intrusted the work of making a specially-detailed 
geological and geographical survey of .the Yellowstone National 
Park. The party was divided into two sections for the prosecu- 
tion of this work; one section, consisting essentially of Mr. 
Gannett, topographer, and Mr. W. H. Holmes, geologist, made the 
general survey of the park, while the other, consisting of Dr. 
A. C. Peale and Mr. 1. E. Mushbach, were occupied in making de- 
tailed studies and maps of the geyser and hot-spring localities, 
a work of the greatest interest and value to the scientific world. 
"In the meantime Mr. Holmes made sketches covering every 
square mile of the Park, an area of 3,500 square miles. In such 
minute detail was the work done that the economic resources, as 
well as all the minor features of the geology, can be laid down 
on a map on a scale of one mile to an inch with the greatest care 
and minuteness. The great variety of forms which the mountains 
