Vol XI 
Plate X 
Fig-1 
Magnified ! 50 Diam? 
R.O O GELLA 
Phyc of si 
Magnified 4 Qiam ? 
W .H W/<_KJ K&OM 
C OLOXJR. R F A.CTIOISL 
HEP>PLO Pf<£S3 L / 
