No. 428.) THE ANATOMY OF A DOUBLE CALF. 607 
each side running out to reach the common territory. The dis- 
tance from this junction to the anus is seven feet and two inches, 
in all of which the intestine is single. The single small intes- 
tine arises obliquely out of the common passage, and not, as 
might be expected, squarely from it. After running a distance 
of three feet, the small intestine dilates to form the asin intes- 
tine. Here two ceca 
of unequal size are 
located. The two 
ceca are exactly op- 
posite each other, and 
their cavities are con- 
tinuous. At their 
junction they open 
together into the 
intestine at the begin- 
ning of the large 
intestine. The large 
intestine runs directly 
to the single anus, a 
distance of four feet he. T t the junction of the 
and two inches. scat airepor aea 
There is normally in the calf only a single cæcum. The 
presence of two, then, is due to contributions being present 
from each of the component bodies of the animal. The 
single intestine could be interpreted in either of two ways, 
viz., that there was a single intestine into which that of the 
other half had been engrafted not far from the stomachs, or 
that the intestine is really parts of two fused in the middle 
line and thus forming one. The oblique insertion of the single 
intestine at its origin seems at first to favor the first view, but 
there is considerable evidence against it. Dr. Wyman (’66), in 
the case of a double human embryo which he dissected, found 
that the intestines meet in the middle line and fuse to form a 
single tube, which, however, soon parts, forming two which run 
side by side for a time, after which they unite in a single rectum 
and terminate in a single anus. The presence of the two cæca 
in the case before us indicates that parts of two intestines, each 


