Richards and Archibald — Growing u Crystals 



Plate 



Figure 2. Baric chloride ; 30 diam.; 

 exposure 0.04 sec. 



Figure 4. Sodic nitrate : 30 diam. 

 exposure 0.10 sec. 



Figure 6. Baric chloride; 110 diam.; 

 exposure 0.10 sec. 



Figure 3. Baric chloride ; 30 diam. : 

 exposure 0.08 sec. 



****** stiT, 



I •. I 1 » * . ■ \ 



Figure 5. Sodic nitrate; 30 diam. 

 exposure 0.12 sec. 



Figure 7. Cupric sulphate; 110 diam.; 

 exposure 0.12 sec. 



