162 
HISTOLOGY OF ANIMALS. 
stripped off, but not from the surfaces of the more 
perfect joints. All my examinations tend to prove that the 
synovial membrane is continued a short distance beyond 
the vascular network, and that it ends at the point 
where friction commences. The cells on the surface 
of the cartilage, which have so frequently been mistaken 
for those of epithelium, are nothing more than ordinary 
cartilage-cells very much flattened ; the resemblance of 
these cells to epithelium is most strikingly shown, as I 
have already stated, in the Batrachian reptiles. 
