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|. HAGA AND Prof. F. M. JAEGER: RONTGENPATTERNS OF TETRAGONAL CRYSTALS. PLATE IL. 
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Fig. 5 Fig. 6. 
ickelsulphate. (6H,0). Plate parallel to (001) Nickelselenate (6 HO. Plate parallel to (001). 
| Fig. 7. Fig. 8. 
\ickelselenate. (6 H,0). Plate parallel to (100). Nickelselenate. (6H,0) Plate parallel to (110). 
of the Acad. of Sciences, Amsterdam XVIII Ao 1915/1916. HELIOTYPE, VAN LEER, AMSTERDAM 
