646 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



TABLE XVI. 

 Temp. 16.6. Silver Nitrate, N. 

 Potassium Chromate, 



N 

 T5T5- 



TABLE XVII. 



Temp. 16.6. Silver Nitrate, N. 

 Potassium Chromate, -^. 



TABLE XVIII. 



Temp. 16.6. Silver Nitrate, ". 

 Potassium Chromate, 7 ^. 



TABLE XIX. 



Temp. 16.8. Silver Nitrate, ™. 

 Potassium Chromate, ^. 



