170 Hassler's Experiments on the Expansion of Water. 
my analyses agree well with each other. 
With reference to his article on emerald-nickel, it suffices to 
say, that I have described the mineral in 1851 under the name 
Nickelgymnite.* It is a variety of gymnite in which a variable 
quantity of magnesia is substituted by nickel, and when pure, 
it does not contain a trace of carbonic acid. Mr. Garrett would 
not have arrived at such a scientific formula if he had been mote 
careful in selecting his material. ‘The same is to be said 0 
r. Hermann’s Pennine, which is a mixture of Kammerenile, 
Dolomite, Nickelgymnite, etc. 
at 
Arr. XVIIL.—Hassler’s Experiments on the Expansion of Wa- 
ter at various temperatures ; by J. H. Auexanper, Esq. 
Tue late Mr. Hassler enjoyed, during his life-time, a high re- 
putation: but one founded, i uld appear, at least in this 
country, more upon the prestige of his manifest and presume 
moral and intellectual faculties, than upon any just knowledge 
or estimate of his special achievements in Science or Art. 
is true that these faculties were both large and_ well-defined ; 
and they had a scope for their exhibition, sometimes, more favor- 
able to the interest of the spectator than the ease and comfort of 
the actor. He was undaunted, diligent, patient, self-reliant ; n° 
> . a : a . 
ith a spice of dogmatism, that like carbonic acid in certai® 
Ww 
wiues (itself an irrespirable gas) only served to make them more 
racy and montants. Unfamiliar people were apt to suppose that 
* Keller-Tiedemann’s Nordamerika bude Nex 1G - 
f 
