928 
IIS'DEX. 
Carpenter (W. B.). Researches on the Roraminifera. Part III. — On the Genera Penerophs, Oper- 
culinEj and Amphistegina, 1 ; Peneroplis^ 2 ; Operculinaj 12 ; Amphistegina, 30 ; explanation of 
the plateSj 36. 
Cayley (A.). A Sixth Memoir upon Quantics^ 61. — ^On geometiy of one dimension, 62 ; on geometry 
of two dimensions, 69 ; on the theory of distance, 82. 
— On the Double Tangents of a Plane Curve, 193. 
— On the Conic of Pive-pointic Contact at any point of a Plane Cnrve, 371. 
Chemical rays, measure of, as determined by the combination of chlorine and hydrogen, 879 (see 
Bunsen). 
Clarke (J. Lockhart), Further Researches on the Grey Substance of the Spinal Cord, 437. — Struc- 
ture of the caput cornu posterioris, 439 ; on the grey substance of the filum terminate, 453 ; of the 
epithelium of the central canal, 455 j appendix, 458; explanation of the plates, 461. 
Colour -hlindness, 323. 
Compression, thermal effects of, on solids (longitudinal compression), 119; on fluids, 133. 
Conic of five-pointic contact at any point of a plane curve, 371. 
Crace-Calvert (P.) and Johnson (R.). Conductibility of Mercury and Amalgams, 831. 
Cubic, conic of five-pointic contact with a, 384, 394. 
D. 
Double tangents of a plane curve, 193. 
E. 
Elliptic functions, 171 (see Merripield). 
Ellis (G. V.). Researches into the Nature of the Involuntary Muscular Tissue of the Urinary Bladder, 
469. 
F. 
Fairbairn (W.) and Tate (T.). On the Resistance of Glass Globes and Cylinders to Collapse from 
external pressure ; and on the Tensile and Compressive Strength of various kinds of Glass, 213. — 
Tenacity of glass, 215; resistance of glass to crushing, 217; resistance of glass globes and cyhn- 
ders to internal pressure, 224 ; to external pressure, 231 ; reduction of the results, and formulse, 
241. 
Farr (Dr. W.). On the Construction of Life-Tables, illustrated by a New Life-Table of the Healthy 
Districts of England, 837. (For Contents, see pp. 837, 838.) 
Foraminifera, researches on, 1 (see Carpenter). 
Frankland (Dr. E.). Researches on Organo-metallic Bodies. Foui’th Memoir, 401. — Action of zinc- 
ethyl upon iodide of stanethyl, 402 ; action of zincmethyl, 405 ; of zincethyl on iodide of mercury- 
methyl, 409 ; of zincmethyl on chloride of mercuryethyl, 410 ; of zinc on a mixtui'e of the iodides 
of ethyl and methyl, 411 ; preparation of zincmethyl, 412. 
G. 
Gassiot (John P.). On the Stratifications in Electrical Discharges, as observed in Torricellian and other 
Vacua. Second communication, 137. — Character of the stratified discharge under different condi- 
