622 
INDEX. 
C. 
Calculus of operations, on an extended form of the index symbol in the, 13. 
Calorimeter for determining radiating powers, 379. 
Caoutchine, 241 (see Williams). 
Caoutchouc, composition of, 253. 
Carpenter (Dr. W. B.). Researches on Foraminifera. Fourth Series, 535. — Genus Polystomella, 
535; Tinoporus, 557 ; Carpenteria, 564; concluding summary, 569; explanation of plates, 586. 
Carpenteria, 564. 
Cayley (A.). On the Equation of Differences for an Equation of any Order, and in particular for 
Equations of the Orders Two, Three, Four, and Five, 93. 
Note respecting Formulse of Dr. Brinkley’s, 321. 
Colour-blindness, 78 (see Maxm'ell). 
Compass, deviations of the, on board ship, 337 ; Admiralty standard, 358 (see Evans). 
Compound colours, on the theory of, 57 (see Maxwell). 
Copper, on the effect of metals and metalloids on the electric conducting power of pure, 85. 
Crystallographic determinations of artificial crystals, 416-522. 
Cubics, quaternary, 229 (see Salmon). 
D. 
De la Rue (W.) and Muller (H.). On the Resin of Ficus rubiginosa, and a new Homologue of 
Benzylic Alcohol, 43. — Sycoretin, 45 ; acetate of sycoceryl, 47 ; alcohol of sycoceiyl, 50. 
Disulphide of carbon, test for, 431 ; itself a test for phosphorus-bases, 431. 
Donkin (Professor W. F.). On the Analytical Theory of the Attraction of Solids bounded by surfaces 
of a hypothetical Class including the Ellipsoid, 1. 
E. 
Earnshaw (Rev. S.). On the Mathematical Theory of Sound, 133. — Wave-motion when change of 
temperature is neglected, 133; when not neglected, 143. 
Electrical discharge, effect of, on gases, 113 (see Andrews). 
Elliptic and ultra-elliptic functions, 223 (see Merrieield). 
Equation of differences, 93 (see Cayley). 
Evans (F. J.). Reduction and Discussion of the Deviations of the Compass observed on board of all 
the Iron-built Ships, and a selection of the '\Tood-built Steam-ships in Her ^lajesty’s Navy, and 
the Iron Steam-ship ‘ Great Eastern,’ 337. 
Evans (J.), letter from, on the form and nature of flint-implements found near Abbeville and Amiens, 
Fairbairn (W.) and Tate (T.). The Bakerian Lecture. Experimental Researches to determine the 
Density of Steam at different Temperatures, and to determine the Law of Expansion of Superheated 
Steam, 185. — Saturation-gauge, 186; experiments at pressures varying from 15 to 70 pounds per 
square inch, 190; at pressures less than the atmospheric pressure, 208; generalization of results, 
219. 
Ficus rubiginosa, on the resin of, 43 (see De la Rue). 
