410 Messrs. Nichols and Snow on the Influence of 



Fie:. 4. 



6 



s 



ir 



6/** .SM- 



3 C 



Q 



Fig. 5. 



£ F G 



c CtC^oL 



«/*■ -sr- 



A B C D E F G- 



it cannot be mistaken for that of molybdic acid (fig. 5), of 



