54.7 



INDEX TO VOL. XVIII. 



ACETAL, observations on, 289. 



Acetic acid, on the synthesis of, 584. 



Acetone, on chlorinated, 453. 



Acids, on new volatile organic, from 

 the berry of the Mountain Ash, 3/9. 



Airy (G. B.) on a proof of the theorem 

 that everv algebraical equation has 

 a root, 230. 



Alcoholic fermentation, on, 239. 



Algebraical equation, on the theorem 

 that every, has a root, 230, 436. 



Alison (Dr. S. S.) on the intensifica- 

 tion of sound through solid bodies 

 by the interposition of water be- 

 tween them and the distal extre- 

 mities of hearing-tubes, 146. 



Alloys, on the specific gravities of, 354. 



Amalgams, on the conductivity of, 

 541. 



Arithmetical progressions, proposi- 

 tions upon, 532. 



Arsenic, on the presence of, in some 

 artificial manures, and its absorp- 

 tion by plants, 108. 



Atkinson (Dr. G.), chemical notices 

 from foreign journals, 128, 285, 

 451. 



Attractive forces, on a mathematical 

 theory of, 321. 



Australia, on the geology of Southera, 

 77. 



Azurite, on the production of, 397. 



Babbage (C.) on the discovery in vai'i- 

 ous localities of the remains of 

 human art mixed with the bones of 

 extinct races of animals, 297. 



Baryta, on the determination of, 220. 



Batteries, on platinized graphite, 7'-^- 



Bauerman (II.) on the geology of the 

 south-east part of Vancouver's 

 Island, 475. 



Beauvallet (P.) on the presence of 

 vanadium in the clay of Gentillv, 

 480. 



Becquerel (E.) on the luminous effects 

 ])roduccd by tiie action of light u|)on 

 bodies, 524. 



Bee's cell, on the construction of the, 

 428. 



Beilstein (M.) on acetal, 289. 



Beketoff (]\I.) on a new mode of for- 

 mation of chloride of benzoyle, 134. 



Benzoyle, on the chloride of, 134. 



Bernal (F.) on the so-called mud- 

 volcanos of Turbaco, near Cartha- 

 gena, 475. 



Blowpipe experiments, 513. 



Bodies, on the percussion of, 241. 



Bois-Reymond (E. du) on the sup- 

 posed acid reaction of muscular 

 fibre, 544. 



Bolley (Dr. P. A.), contributions to 

 the theory of dyeing, 481. 



Books, notices respecting new : — 

 Delesse's Etudes sur la Metamor- 

 phisme des Roches, 61; Salmon's 

 Modem Higher Algebra, 67; Tod- 

 hunter's Analytical Geometiy, 

 Todhunter's Plane Trigonometry, 

 Besant's Hydrostatics and Hy- 

 drodynamics, 221 ; Jerrard's Essay 

 on the Theory of Equations, 3/8 ; 

 Burchett's Practical Geometry, 459. 



Brewsterite, on, 219. 



Brodie (B. C.) on the atomic weight 

 of graphite, 539. 



Bromine, on the equivalent of, 279. 



Buckton (G. B.) on the organo-me- 

 tallic radicals, 383. 



Bunsen (R.), blowpipe experiments, 

 513. 



Butlejow (Dr.) on dioxymethylene, 

 28/. 



Calvert (Dr. F. G.) on the specific 

 gravities 'of alloys, 354 ; on the 

 conductivity of mercury and amal- 

 gams, 541. 

 Cambridge Philosophical Societv,pro- 



ceedings of the, 227, 308. 

 Campbell fU.) on a test for ascer- 

 taining whether an observed degree 

 of uniformity, or thu revcrs(!, in 

 tables of statistics is to be looked 

 u|)on as reinurkuble, 359. 



2 N2 



