INDEX 
TO THE 
PHILOSOPHICAL TPANSACTIONS 
FOE THE YEAE 1857. 
A. 
Airy (George B., Esq.). Account of the Construction of the New National Standard of Length, and 
of its principal Copies, 621. 
Alcohols, on a new class of, 555 (see Hofmann). 
Allylic alcohol, 555 (see Hofmann). 
Amyle, obtained from Boghead coal, 456. 
B. 
Bakerian Lecture, 145 (see Faraday). 
Barlow (W. H., Esq.). On an Element of Strength in Beams subjected to Transverse Strain, named 
by the author “ The Resistance of Flexure.’^ — Second Paper, 463. — Resistance of flexure in wrought 
iron, 480 ; experimental determination of the neutral axis, 480. Appendix by P. Barlow : Appli- 
cation of the preceding principles to beams and girders of non-symmetrical section, 483. 
Boghead coal, on some of the products of the destructive distillation of, 447, 737 (see Williams). 
Boole (Professor G.). On the Comparison of Transcendents, with certain applications to the Theory of 
Definite Integrals, 745. 
Brachionus, observations on, relative to its dioecious character, 314. 
Brooke (H. J., Esq.). On the Geometrical Isomorphism of Crystals, 29. 
Bunsen (Professor R.) and Roscoe (Dr. H. E.). Photo- chemical Researches. — Part I. Measurement 
of the Chemical Action of Light, 355. — Strict equality of volume of the chlorine and hydrogen 
evolved by electrolysis of hydrochloric acid, 357 ; absence of combination of the mixed gases in the 
dark, 359 ; description of the instrument employed, 359 ; gradual development of the maximum of 
photo-chemical action, 363 ; cessation of photo-chemical action as soon as the light is cut off, 374 ; 
standard flame, 374. 
6 B 
MDCCCLVII. 
