(Kohts,  Vircliow's  Archiv,  lxvii,  p.  425,  and  pi.  xiv.)

Cerebral  cancer  is  usually  vascular,  and  forms  sharply  limited  tumors,  con-
taining large  cells,  which  sometimes  have  several  nuclei.  When  seated  in
the  dura  mater  the  tumors  are  usually  small  and  vascular,  and  may  perforate
the  bone,  or  grow  into  the  brain,  and,  like  the  similar  form  of  sarcoma,  are
often  termed  "  fungus  hsematodes."

The  rarer  forms  of  tumor  may  be  briefly  described.  The  so-called  myxo-
mata  are  merely  mucoid  forms  of  glioma.  Melanotic  tumors  have  been  met
with,  always  associated  with  similar  growths  elsewhere.  Fibroid  tumors  are
very  rare,  and  have  been  met  with  chiefly  in  the  cerebellum  or  cerebellar
peduncle,  small  in  size,  usually  single,  but  in  one  case  multiple.  Bony
tumors  are  usually  partly  fibroid,  "  osteo-fibromata. "  They  have  been  met
with  chiefly  in  the  cerebral  hemispheres,  once  in  the  cerebellum,  once  in
the  central  ganglia,  and  once  were  multiple.     (It  must  be  remembered  that


*  See  Medico-Chirurgical  Trans.,  vol.  lix,  1876,  p.  217.
