] 76 (>N Till-: I'.KC.OT OK K()UII)AK 
chant^cd to Prickle Cells. 
The Papillae of the pad of the cat are comparatively less deveIoi)ed and 
are cone-sha]ied. These arc filled with connective tissue, which is joined 
perpendicularly to the tissue in the Stratum Reticulare. This latter tissue is 
finer and contains many small blood vessels. 
In the Cutis Vera of these balls, hair roots and sweat glands are not 
fount!, but on the border line between the common skin and the pad many 
hair roots and sweat glands arc found. 
My histological studies of the pad of the cat have enabled me to verify 
the following important facts : 
The Papillae of the pad of the cat are cone-shaped with broad base and 
pointed top, and they are enveloped with a layer of Prickle Cells. They 
never penatrete the Stratum Spinosum and keep a simple form, 
b) Pad of the dog. 
The histological structure of the pad of the dog differs very slightly from 
that of the cat. I have, therefore, to avoid repeating myself, described only 
the differences, which are as follows : 
Stratum Corneum is more developed than in the cat and I have obtained 
the following average measurement : 0.45 mm. 
Stratum Lucidum, as in the cat, is a very thin layer, fine and clear and 
difficult to stain. 
Stratum Spinosum is a very sim[)le wave-like laj-er and thin as in the cat. 
The Prickle Cells are difficult to stain and contain a distinct round nucleus, 
which, as the cells gradually reach Stratum Germinativum, becomes easier to 
color, and the cells themselves become flatter and flatter. 
Stratum Germinativum, in the case of a colored pad, contains ver}' 
many pigment cells in its lower part. This pigment is found in the bottom 
layer of cells which make a mitotic division, and it [passes upwards with the 
divided cell. 
The Papillae in this pad are larger than in the cat and are of an elongated 
cone form. They are enveloped by Stratum Malpighii, but their tops do not 
