INDEX. 
625 
Solar spectrum, relations of the colours of the, 57 (see Maxwell) ; lines of the, 149 (sec Brewster). 
Sound, on the mathematical theory of, 133 (see Earnshaw). 
Species, range of variation of, 570. 
Specimens, preparation of anatomical, for the microscope, 617. 
SpoTTiswooDE (W.). On an Extended Form of the Index Symbol in the Calculus of Operations, 13. — 
Postscript, 39. 
Steam, density of, and law of expansion of superheated, 185 (see Faibbairn). 
Sycoceryl, acetate of, 47 ; alcohol of, 50. 
Sy CO retin, 45. 
T. 
Tait (Professor P. G.) and Andrews (Dr. T.), On the Volumetric Relations of Ozone, &c., 113 (see 
Andrews). 
Tate (T.) and Fairbaibn (W,). — The Bakerian Lecture. Experimental Researches to determine the 
Density of Steam, &c., 185 (see Fairbaibn). 
Thermal effects of fluids in motion, 325 (see Thomson). 
Thomson (Professor W.) and Joule (Dr. J. P.). On the Thermal Effects of Fluids in Motion. — 
Part III. On the Changes of Temperature experienced by bodies moving through Air, 325. 
Tinoporus, 557. 
Triethylphosphine, preparation of, 410; oxide, &c. of, 412; employment of, as a test for disulphide of 
carbon, 431 (see Hofmann). 
Twin axis a zone-axis not perpendicular to a crystalline face, 520. 
W. 
Williams (C. G.). On Isoprene and Caoutchine, 241. — Action of atmospheric oxygen on isoprene, 
245 ; caoutchine, 246; composition of caoutchouc, 253 ; summaiy of results, 255. 
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