FIG. I2.—Instrument shelter in which thermograph was kept, in opening of Engel

mann spruce forest, June 6, 1908.

scattered spruce twigs and needles.

The snowdrift in the foreground is covered with
Photograph by Mr. G. S. Dodds.

(IV)

THE

UNIVERSITY OF COLORADO

STUDIES

FRANCIS RAMALEY

EDITOR

PUBLISHED BY THE

UNIVERSITY OF COLORADO

BOULDER, COLO.

APRIL, 1909

Price, 50 Cents

3. THE ELECTROCHEMISTRY OF THE SOLUTION of Gold in Potas-

SIUM CYANIDE

JOHN B. EKELEY, PH.D.

Professor of Chemistry

and

ARTHUR L. TATUM, M.S.

Instructor in Chemistry

4. AN ANNOTATED LIST OF THE BIRDS OF BOULDER COUNTY,

COLORADO

JUNIUS HENDERSON, B.A.

Curator of the Museum

5. THE BEMBECID WASPS OF BOULDER COUNTY, COLORADO.

SIEVERT A. ROHWER

6. THE SILVA OF COLORADO. IV. FOREST FORMATIONS AND

FOREST TREES

FRANCIS RAMALEY, PH.D.

Professor of Biology

187

215

219

243

249