282 



Chemical Examination of the 



12 



>j - 





unmixed. 



sul. of cop. 



3 7 2 



idem. 



Observations. 



Larger eyes than the preceding, more 

 moist, dough of sour smell, color dull. 



Eyes irregular, hollow within, moist, 

 brown color, smell strong. 



Compact and heavy, very moist, brown, 

 greenish, smell sour. Its bad quality is 

 owing to excess of copper. Longer ba- 

 king might have helped it. 



More pasty than the last, hollow, crust 

 separates from the crumbs, green, very 

 disagreeable odor, pretty free from ex- 

 cess of copper. 



Brown bread. 



Fine, rather flat, uniform grain, the 

 smell of bran not disagreeable. 



Much lighter than the last, more moist and 

 friable, deeper color, and doughy smell. 



Doughy, very greasy, sticking to the 

 knife, numerous large fissures, color very 

 dull, smell of leaven, strong and disa- 

 greeable. Much injured by excess of 

 copper. 



Art. Vin. — Chemical Examination of the Bark of the White 

 Birch; by Owen Mason, of Providence, R. L 



When residing in the country some years since, I had frequent 

 opportunities of observing the extreme combustibility of the exterior 

 bark, or cuticle, of the white birch, (Betula alba,) and its durability, 

 when exposed in situations favorable for a speedy decomposition. 

 In every swamp where the white birch abounds, there are usually 

 many trees which have been prostrated by the winds, and those will 



