By Mr. Robert Fortune. 



517 



Some farther experiments were commenced on the 1st of April 

 in the present year to ascertain what effects mercurial vapour and 

 weak muriatic acid would produce upon balsams. Seven hand-glasses 

 with moveable tops were placed side by side in the pit of a moist 

 stove and numbered from 1 to 7 inclusive. Seven balsams of the 

 same size, and equally healthy, were placed, below them, one in each. 

 A small pan was then put under each glass to receive the chemical 

 preparations, and the whole being ready, the following substances 

 were put into them — 



No. 1. Half an ounce of mercury. 



2. Half an ounce of corrosive sublimate, mixed with wet 



saw dust. 



3. Was left in its natural state. 



4. Weak muriatic acid. 



5. Half an ounce of dry calomel. 



6. Half an ounce of dry corrosive sublimate. 



7. Moistened shavings of Kyanized wood. 



The following table of observations will shew which of the 

 substances proved injurious or otherwise, and the manner in which 

 the plants were affected. They were examined daily, but remarks 

 in the table were made only when the effects were particularly 

 apparent. 



