Chemistry and Physics. A27 
mercury in a bottle, the mercury is always divided into rounded glob- 
ules, which remain separated from each other for a long time; but 
what is very striking is, that the size of the globules, which varies 
enormously, is always connected with the nature of the aqueous solu- 
tion. Some solutions immediately cause extreme division in the mer- 
oxydation of the mercury. In trying some experiments, Mr. Swan of 
this city, was led to put crystals of sulphate of soda into the diluted 
sulphuric acid, when he found the a to be more uniform, and the 
More than a hundredth of a degree from the truth, that the maximum 
€ result arrived at by Despretz, from a very extensive series of 
experiments with an apparatus similar to that employed by Hope, was 
..* This stand - Hassler, in his elaborate investigations during 
the years 1830-1839, with ropeed re the weights and measures of the United States, 
after Previously determining, by a long series of experiment, 39°-83 to be the tem- 
