ial Crystals 
iax 
ial and B 
1ax 
f some Interference-Curves of Un 
by Superposition of Elliptic Pencils’’. 
10n oO 
W.N. LE HEUX: “Explanat 
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BP 
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& 
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: ke) 
NS a 
ANAASS bd 
~ 55 
N N A\ E 
RAS < 
NN 5 
„Ap NEN NEEN N MS 
\< NS ss 
SRS AV ssz“~1 asx“ x 
S as 
SS n 
SS ‘on 
5 
ae 
o 
o 
TOC 
