Experimental Researches in Electricity. - Thirtieth Series. § 38. Constancy of differential magnecrystallic force in different media. § 39. Actuion of heat on magnecrystals. § 40. Effect of heat upon absolute magnetic force of bodies. (Sections 3363--...

1856. (London, Richard Taylor and William Francis, 1856). 4to. No wrappers as extracted from "Philosophical Transactions" Vol. 146 - Part I. Pp. 159-180. Clean and fine. First appearance of a historical paper in physiscs.This paper is the last of Faraday's papers in the series "Experimental researches in electricity". The paper is the only one of the 30 papers which was not reprinted in the 3 volume work, published 1856.From 1831 to 1852 Michael Faraday published his "Experimental Researches in Electricity" in The Philosophical Transactions of the Royal Society. These papers contain not only an impressive series of experimental discoveries, but also a collection of heterodox theoretical concepts on the nature of these phenomena expressed in terms of lines of forces and fields. He published 30 papers in all under this general title.They represents Faraday's most importent work, are classics in both chemistry and physics and are the experimental foundations for Maxwell's electro-magnetic theory of light, using Faraday's concepts of lines of force or tubes of magnetic and electrical forces. His many experiments on the effects of electricity and magnetism presented in these papers lead to the fundamental discoveries of 'induced electricity' (the Farday current), the electronic state of matter, the identity of electricity from different sources, equivalents in electro-chemical decomposition, electrostatic induction, hydro-electricity, diamagnetism, relation of gravity to electricity, atmospheric magnetism and many other."Among experimental philosophers Faraday holds by universal consent the foremost place. The memoirs in which his discoveries are enshrined will never ceaseto be read with admiration and delight; and future generations will preserve with an affection not less enduring the personal records and familiar letters, which recall the memory of his humble and unselfish spirit."(Edmund Whittaker in A History of the Theories of Aether and Electricity).