Faraday 1855
PREFACE.
For reasons stated in the First Volume of these Experimental Kesearches, I have been induced to gather the remaining Series together, and to add to them certain other papers devoted to Electrical and Magnetic Research.
To the prefatory remarks containing these reasons, I would recall the recollection of those who may honour these Researches with any further attention. I have printed the papers in this Volume, as before, with little or no alteration, except that I have placed the fair and just date of each at the top of the pages.
As regards magnecrystallic action, which commences at Paragraph 2454, the reader will see the gradual change and enlargement of view respecting its nature in the course of long investigations at the following places, 2550. 2562. 2576. 2584. &c., 2591. 2639. 2797. 2818. 2836. &c. I would refer readers to the paper by Tyndall and Knoblauch in the Philosophical Magazine, 1850, vol. xxxvii. p. 1, for a very philosophical acccount of the physical cause of the magnecrystallic action*, and to the paper by Professor W. Thomson on the theory of magnetic induction in crystalline and non-crystalline substances in the Philosophical Magazine, 1851, vol. i. p. 177, as being in all parts in perfect accordance with the various experimental results which I have at different times obtained.
With respect to Paragraphs 2967. 3242, and the intentions there expressed of experimenting with oxygen at low temperatures, I have endeavoured to carry these intentions out ; but the extreme difficulty of working on such attenuated matter as gases at low temperatures, without the production of air-currents able to influence the very delicate torsion-balance and apparatus required to measure the result, is so great as to have prevented me as yet from obtaining any results worthy of confidence.
I owe many thanks to the Royal Society and to the Proprietors of the Philosophical Magazine, for the great kindness I have received in the loan of plates, &c., and in other facilities granted to me for the printing of the volume.
As the Index belongs both to the Experimental Researches and to the other papers, its references are of necessity made in two ways ; those to the Researches are, as before, to the numbers of the paragraphs, and are easily recognized by the greatness of the numbers : the other references are to the pages, and being always preceded by p. or pp. are known by that mark.
MICHAEL FARADAY.
January, 1855.
*) Marcliand and Scheerer say that bismuth is expanded by pressure and has its structure changed. Gmelin’s Handbook, iv. p. 428.
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