﻿Smithsonian 
  Report, 
  1929. 
  — 
  Scares 
  

  

  PLATE 
  4 
  

  

  1. 
  TYPICAL 
  Spiral 
  Nebulae 
  seen 
  Edge 
  on 
  

  

  a, 
  HV 
  24 
  Comae 
  Berenices; 
  6, 
  N. 
  G. 
  C. 
  5746, 
  Virgo; 
  c, 
  HV 
  19 
  Androinedae; 
  photographed 
  

   'with 
  the 
  60-inch 
  reflector. 
  In 
  outline 
  the 
  nebulae 
  resemble 
  tlie 
  flattened 
  watch-shaped 
  

   form 
  of 
  our 
  own 
  system. 
  Dark 
  obscuring 
  clouds 
  lying 
  close 
  to 
  the 
  central 
  plane 
  of 
  the 
  

   nebulae 
  are 
  conspicuous 
  in 
  each. 
  

  

  2. 
  OUTLYING 
  Regions 
  of 
  M 
  31, 
  photographed 
  by 
  Hubble 
  with 
  

   THE 
  100-INCH 
  Reflector 
  

  

  Parts 
  of 
  the 
  nebula 
  which 
  on 
  smaller-scale 
  photographs 
  appear 
  as 
  knots 
  or 
  condensations 
  

   are 
  here 
  fully 
  resolved 
  into 
  stars. 
  

  

  