The Papers of Joseph Henry


[Text omitted. -Ed.] on the very da[y ...]ther.
I am at a loss to account for the glass not reaching you. It was enclosed within two or three pamphlets and prepaid. It grieves me indeed—as I know Prof— Faraday thought to please you, particularly.[2] I beg you will tell him this circumstance when you write him—
[Text omitted. -Ed.] the fact [?with] [Text omitted. -Ed.] the increase of radiant [Text omitted. -Ed.] the introduction of an incombustible body into flame is certainly most interesting.[3] Is the increase so very considerable that you might mark the differences, between the effects of Baryta, Strontia, Lime, and Magnesia compounds—say hydrates of the first three & carbonates of all?[4] I think I mentioned to you[5] having found the conducting powers, and [ge]neral chemical properties to be [Text omitted. -Ed.] the degree of their intensity, in [th]e order of their atomic weights. [I] have just been through with the entire chemical history of all the compounds of these earths & find the law true with two or three exceptions— If you would like to make the experiment, & have not the substances I will try and prepare them for you—though as yet I have no laboratory.

I am very Respectfully and truly yours,

Eben N. Horsford
Prof Joseph Henry. LLD.
Henry Papers, Smithsonian Archives. The top half of the first sheet and one side of the second sheet are missing; the ellipses indicate where one or two words are missing, except at the first and third instances, which indicate where the first sheet is torn in half.
    [1] The newly elected Rumford Professor on the Application of Science to the Useful Arts at Harvard. Henry Papers, 6:51.
    [2] Faraday had given Horsford some glass for reproducing the Faraday effect which Horsford had dutifully forwarded along with a letter of December 31, 1846. Henry wrote on January 8 that the glass had not arrived with the letter. Evidently Henry's letter had not reached Horsford by March 2, when Horsford wrote to ask for Henry's advice on his new position and to inquire whether Henry had received the glass. On March 24, Horsford wrote James Hall to complain that Henry had never responded to his three letters from Europe, written at Henry's suggestion and with the assurance of a response, or to his March 2 letter. Horsford attributed Henry's lack of response to "a negligence arising from an immense pressure of duties" or to some unintentional offense on Horsford's part. Henry Papers, 6:621; Mary Henry Copy, Henry to Horsford, January 8, 1847, and Horsford to Henry, March 2, 1847, Henry Papers, Smithsonian Archives; Horsford to Hall, March 24, 1847, State Geologists' and Paleontologists' Correspondence File, Series B0561, New York State Archives.
    [3] Henry had evidently described to Horsford his experiments of late March on the increased radiation of heat from a flame due to the introduction of an incombustible solid.
    [4] In his later paper on these experiments, Henry mentioned trying "glass, carbonate of lime, sulphate of lime, stone coal, fire clay, &c." but being unable to determine relative effects without specimens of equal diameter. "On the Effect of Mingling Radiating Substances with Combustible Materials," AAAS Proceedings, 1855, 9:112–116.
    [5] In his letter of December 31, 1846 (Henry Papers, 6:622).
    [A] Moved from end of letter.