QUARTERLY CHRONICLE OF MICROSCOPICAL SCIENCE. 7 
rod-like processes, which are directly connected with the 
protoplasm of the cell, the hyaline layer rarely encircling 
the base, but leaving the surface naked. They have been 
seen in movement in frogs after injury to the spinal cord or 
medulla oblongata, but not in warm-blooded animals. The 
movements are stated to be active during the absorption of 
fat, whose particles are seized by the processes, which are 
then retracted, so that after the cell is gorged with fat the 
striated band is no longer visible, the cells being bounded only 
by a homogeneous layer. The author confirms Heidenhain 
in stating that the extremities of the epithelial cells are pro- 
vided with one or two processes which communicate with 
connective-tissue corpuscles in the stroma of the villus. In 
addition, there is a delicate process coming off from the 
nucleus of the epithelial cell, and passing to granular cells 
with a vesicular nucleus, three or four times larger than the 
connective-tissue corpuscles. These the author considers to 
be nerve-cells. Hence the epithelium has processes of two 
kinds—connective-tissue processes, rarely more than two in 
number, and a nervous process which is always single. 
The connective-tissue corpuscles form a network communi- 
cating with the central lacteal, but not with the capillary 
blood-vessels, and thus furnish a channel of absorption for 
the chyle. 
3. Blood-vessels of the Small Intestines.—A. Heller (Lud- 
wig’s ‘ Arbeiten,’ vol. vil) arrives at the following results :— 
1. Every villus contains an artery which runs, as a general 
rule, to the point of the villus without branching. In man 
only does it begin from the middle of the villus to lose itself 
in a capillary network. 2. The vein begins either in the 
point of the villus (rabbit, man) or near to the same (rat), 
and generally goes directly into the submucous tissues without 
receiving any lateral branches ; or it rises near the base of 
the villus, and receives more or less numerous lateral branches 
from the glandular layer (dog, cat, pig, hedgehog). 3. In 
none of the animals examined was there to be found the 
often-cited arrangement of an arterial stem going to the point 
of the villus, and of a descending venous stem with a simple 
connecting capillary network between both stems. This is 
of importance with regard to the erection of the villus 
(‘ London Medical Record’). 
4. Dentine, Enamel and Cement, by J. Kollman (‘ Zeits- 
chrift f. Wiss. Zoologie,’ xxiii, p. 354), 
XI. Skin and Hair.—The Structure of the Skin—Pro- 
fessor Tomsa, of Kiew, in Russia, publishes (‘ Archiv f. Der- 
matologie und Syphilis,’ 1873, vol.i; abstract in ‘ London 
