THE PRAIRIE DOG OF THE GREAT PLAINS. 
261 
Inirrow went aowii nearly vertically to a depth of 14^ feet below the 
surface, when it turned abruptly and became horizontal, as shown in 
the diagram. The horizontal part was 13^ feet in length. One- 
third of the horizontal part (the terminal tt feet, F) and two old nests 
and passageways (E) were plugged with black earth brought in from 
. Moomdy 
.Faniul -jjia/ied cnlmiuc to Ourrow 
. Maui/nassaq-c^-^z iiuk.uvdcamcter 
ab-om idRd-iiiUiuitIv _ 
Jlonzoiilaiiiassacj^9/zf€.dui Laujui. 
. amuidnesUfLLUdiMvlh auHurefust. 
. Unustdiioni ofIu)rbzoiital]ia65aae 
aacd with cavUt dc ( 4- fut lon^) 
.Nidtehtr^ aiau^hfor ontpraimdocj 
H. ^<^6t of gmJS{l!vitchui.dwcmetcrdi^9iiv- 
ches m height) 
\}. Absorbent matter ca?'iyuuj buul]%l%ioU 
of carboH. 
[{.Position ofPfcarudoqs cls found alto' 
use of buul/i/ude oi xarboiv 
\^Je/dk ofhomontat/jossa^c. 14-fuC 
7 niches 
Fig. 25.— Prairie-dog burroAV. 
the surface layer, which was ver}^ different from the light-coloriHl 
clayey earth in which the greater part of the burrow lay. Four or tivc 
feet below the entrance was a div^erticulum, or short side ptissage 
probably used as a place in which to turn around when the animals 
come back to take a look at the intruder ))efore finally disappearing 5'i 
