1027 
spinal  gaiiglioii.  R.  writes : “It  is  to  tliese  .non-medullated  fibres, 
thé  axons  of  tlie  small  spinal  ganglion  cells,  tliat  we  are  to  look 
T A B L E b. 
Weight  of 
the  body 
Total  num- 
ber of  cells. 
Large 
cells. 
Small 
cells. 
Relation 
between 
large  and 
small  cells. 
Medul- 
lated 
axons. 
: Relation  be- 
tween the 
medullated 
axons  and 
the  cells. 
Relation  be- 
tween medul- 
lated axons 
and  the  large 
cells. 
( 10,3 
10996 
2526 
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1 ;5,5 
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for  the  explanation  of  the  discrepaney  between  the  nnmber  of  spinal 
ganglion  cells  and  inednlated  afferent  tibres.  If  a oonnt  were  made 
the  number  would  probably  closelj  approximate  to  that  of  the  spinal 
ganglion  cells.”  Thns  Ranson  (hinks  that  in  this  way  he  has  solved 
the  problem  cpioted  trom  Heidunhain  above.  If,  however,  we  examine 
the  fignre  15  that  R.  includes  in  his  work,  we  see  that  all  the 
black  spots  in  this  drawing  cannot  be  axons,  bnt  that,  if  all  points 
exist  in  the  preparation,  most  of  them  ai’e  probably  precipitates  of 
silver.  On  the  other  hand  a large  nnmber  of  these  black  dots,  which 
one  can  with  good  reason  assnme  to  be  axons,  show  tracés  of  a 
mednllary  sheath.  It  is,  however,  difticnlt  to  decide  such  a matter 
when  one  has  not  seen  the  preparation  in  qnestion,  bnt  only  what 
is  perhaps  a skeleton  drawing.  My  own  investigations  on  this  |)oint 
show,  howe\  er,  that  R.  has  gone  too  far  when  he  writes  “If  a 
count  of  the  afferent  tibres  were  made,  the  nnmber  wonld  probably 
closely  approximate  to  that  of  the  spinal  ganglion  cells.” 
It  is  trne  that  in  connting  the  nerve  fibres  on  the  silver  impreg- 
