fees a 
5 
_ Supplement to “Nature” February 19, 1914. 
Bellby Transparence of Copper film Produced by polishing. 
ea 
eee Re T- 
Fig. /. x800 
Film covering Fits. Film removed. 
t 
el hl 
a 
: Fig 3 x /800 Fig. 4 
. film covering Pits. film removed. 
