four stories high.

(8) _Dipodomys s. spectabilis_ is not of great economic significance,
except locally, in ordinary seasons. During periods of extreme drought
it may be of critical importance on grazing areas from the standpoint of
the carrying capacity of the range.

(9) Kangaroo rats are easy to poison by following the same formula as
that used by the Biological Survey for destroying prairie dogs.

(10) In many places unsuited to extensive grazing or agriculture
_spectabilis_ does no appreciable damage. It is one of the most
interesting of all the rodents peculiar to our Southwestern deserts, and
should not be molested except where it is destructive.

BIBLIOGRAPHY.

ALLEN, J. A.

1895. On a collection of mammals from Arizona and Mexico, made by Mr.
W. W. Price, with field notes by the collector. Bull. Amer. Mus. Nat.
Hist., vol. 7, art. 6, pp. 193-258. 17 figs. in text.

BABCOCK, S. M.

1912. Metabolic water: Its production and role in vital phenomena.
Research Bull. No. 22, Univ. Wisconsin Agr. Exp. Station, pp. 159 and
170, March.

BAILEY, V.

1905. Biological survey of Texas. North Amer. Fauna No. 25, Biol. Surv.,
U. S. Dept. Agr., pp. 222, 16 pls., 24 figs. in text.

CLEMENTS, F. E.

1905. Research methods in ecology. Lincoln, Univ. Pub. Co., pp. xvii,
334, 85 figs. in text.

GRIFFITHS, D.

1910. A protected stock range in Arizona. Bull. No. 177, Bur. Plant
Ind., U. S. Dept. Agr., pp. 28, 6 pls., 1 fig. in text.

GRINNELL, JOSEPH.

1921. Revised list of the species in the genus _Dipodomys_. Journal of
Mammalogy, vol. 2, No. 2, pp. 94-97, May 2.

MCATEE, W. L.

1921. Farm help from the birds. In Yearbook of the U. S. Dept. Agr. for
1920, pp. 253-270; unnumbered figs. in text.

MERRIAM, C. H.

1890. Description of three new kangaroo rats, with remarks on the
identity of _Dipodomys ordii_ of Woodhouse. In North Amer. Fauna No. 4,
Div. Ornith. and Mamm. (Biol. Surv.), U. S. Dept. Agr., 41-49.

NELSON, E. W.

1918. Smaller mammals of North America. Nat. Geog. Mag., vol. 33, No. 5,
pp. 371-493; numerous unnumbered figs. and colored pls. in text.

ADDITIONAL COPIES
OF THIS PUBLICATION MAY BE PROCURED FROM
THE SUPERINTENDENT OF DOCUMENTS
GOVERNMENT PRINTING OFFICE
WASHINGTON, D. C.
AT
15 CENTS PER COPY

End of the Project Gutenberg EBook of Life History of the Kangaroo Rat, by
Charles T. Vorhies and Walter P. Taylor

*** END OF THIS PROJECT GUTENBERG EBOOK LIFE