te? 3 Nautical Instruction. 
which succeeds it, in the series. Inthe form adopted by Dr. 
De Butts, the copper cases cannot be made, without a much 
greater expense in the workmanship. Those which I have 
used, are formed by machinery, so that they are very hand- 
somely finished, with great rapidity, and all of one size and 
shape. = 
ih consequence of this contrivance, a workman has under- 
taken to furnish Deflagrators, at forty-five or fifty cents for 
every Galvanic pair (seven inches three) contained in 
them. This is much lower than the Paris prices, for appa- 
ratus far less powerful. 
I cannot discover the motive of Dr. De Butts, for having 
the legs of his apparatus of glass—while, from the construc- 
tion of his troughs within, he evidently sanctions my plan o 
omitting insulation. Had I seen the glass legs, without being 
aware of the internal construction of his battery, I should 
have expected to find the inside partitioned by glass. 
Dr. De Butts speaks of the coils of Col. Offerhaus and Mr. 
Pepys, as if that form of the Galvanic battery had originated 
with them; whereas this was one of the forms, first contem- 
plated by me—it was afterwards actually made by Dr. Pat- 
terson and Mr. Lukens, and in a much larger form by Mr. 
Peale and Mr Wetherill,* at least a year, I believe two 
ae ore it was resorted to, either by Pepys or Offer- 
ae 
IL, Foreren. 
Foreign Literature and. Science, selected and translated by Prof. Griscom. 
1. Swepen.—Mutual Instruction.—There are now in 
Sweden sixty-seven schools of mutual instruction ; in which 
the Lancasterian system is practised. Twenty-two of these 
schools have been established since the commencement of 
1823 ; there are thirteen in the capital.— Rev. Encyclopedique. 
* See memoir on a New Theory of Galvanism, Silliman’s Journal, Vol. I- 
Page 118—also Memoir on the Deflagrator, page 41._ 
