HISTOLOGICAL NOTES, 231 
HistotogicaL Notss. By E. Kuen, M.D., F.R.S. 
I. EXAMINING sections through the kidney, hardened in 
methylated alcohol, of the white mouse, I noticed that the 
epithelium lining the first portion of the convoluted tubule, 
i.e. the one following the Malpighian corpuscle, is ciliated, 
in some instances for a longer, in others for a shorter dis- 
tance, the cilia being, of course, on the side facing the lumen 
of the tubule. The epithelium lining the capsule of the 
Malpighian corpuscle nearest to the neck of the tubule, for 
about a third or fourth of the circumference of the capsule, 
is composed of polyhedral or short columnar cells, identical 
in appearance with those of the convoluted tubule, the re- 
mainder of the capsule being lined with flattened squamous 
cells, commonly found lining the whole capsule of the Mal- 
pighian corpuscle in other mammals and man. 
In some instances, also these polyhedral or columnar 
cells of the capsule are possessed of cilia. These cilia are 
visible only in relatively few convoluted tubules, and, as 
mentioned above, in portions that are nearest to the Mal- 
pighian corpuscles. 
The cells to whom these cilia belong show, in some in- 
stances, Heidenhain’s rod-like structures in the outer por- 
tion of their substance, in other instances they, viz. the rod- 
like structures, are not well shown, and still in others, they 
extend more or less distinctly through the whole cell sub- 
stance. 
The cells themselves are polyhedral or short columnar, 
varying in height, 7.e. in the diameter from the lumen to 
the membrana propria of the tubule, between 0-005 and 
0:007 mm. 
The cilia are, in most instances, exceedingly fine, and 
measure in length between 0°0036 and 0:005 mm. 
In some places the whole mass of cilia are more or less 
knitted together, and can be then made out only with high 
powers as fine striations; in others they appear more 
isolated, and are then, of course, easiest seen. But in all 
instances there is a marked boundary line between the cell 
substance and the cilia, these latter penetrating, however, 
into the former. 
In several instanves where the rod-like structures of the 
cell substance are distinct, I see the cilia directly contin- 
uous with them, although, as a rule, the latter are much 
finer than the former. 
