Richards and Archibald — Growing Crystals 



Plate II 



«f t ^ 



nO 



*^ -^ii urn 1 1, 



*mg^ 



Figure 8. Sodic nitrate ; 110 Jiani. ; exposure 0.12 sec. 



Figure 9. Potassic ioilide ; 100 diaiii. ; exposure 0.'2u sec. 



