
          during the Summer. I prepared several tubes
of anhydrs.[anhydrous] liquid Carbonic acid at Princeton a few days
ago & if you wish for one, it shall be sent to you by
an early opportunity. I attempted to make
the gas come over more rapidly by plunging one
end of the tude in a vessel of hot water, while 
the other was surrounded with a freezing mixture,
- but it burst - though without hurting me, as the
shock was probably broken by the water in which
the tube was [added: partly] immersed. I found that the bursting
was owing to some of the sulphate of ammonia
formed by the action of the sulphuric acid on the carbonate
of ammonia) having plugged up the tube about
half way up. So that the gas which was evolved
below had not the benefit of the [refrigerating?] process
above & the elasticity having been doubled, [crossed out: by] at least
by the great heat that I employed [added: (= 76 atmos)] it is no wonder
that an explosion took place. On Monday morg.[morning]
I must go to Princeton [?] give a few lectures more.

I send Endicott's bill for his work on Mr. Downing's plate.
Please let Mr. D. have 10 copies of his paper.

Very sincerely yours,
John Torrey
        