796 
INDEX. 
Plucker (J.) and Hittorf (J. W.). On the Spectra of Ignited Gases and Vapours, with especial re- 
gard to the different Spectra of the same elementary gaseous substance, 1. — Different spectra of 
nitrogen, 6 ; spectra of the first and second orders, 13 ; spectra of sulphur and various other 
elements, 13 ; explanation of the plates, 26. 
Plucker (J.). On a New Geometry of Space, 725. — On linear complexes of right lines, 725 ; on com- 
plexes of luminous rays within biaxal crystals, 760. Additional note, 774. (For Contents, see 
p. 788.) 
Poisons, influence of various, upon blood, 687 (see Harley). 
Pourtales (F. L.), his researches on Foraminifera, 429 (see Parker). 
R. 
Roscoe (H.E.). The Bakerian Lecture. On a Method of Meteorological Registration of the Che- 
mical Action of Total Daylight, 605. — Tables of results, 624. 
S. 
Sea-water, composition of, in different parts of the ocean, 203 (see Forchhammer). 
Sextactic points of a plane curve, 545 (see Cayley); 653 (see Spottiswoode). 
Sigillaria, 579 (see Binney). 
Smith (A.) and Evans (F. J.). On the Magnetic Character of the Armour-plated Ships of the Royal 
Navy, &c., 263 (see Evans). 
Specific heat of solid bodies, 71 (see Kopp). 
Spectra, different, of the same elementary substance, 1 (see Plucker). 
Spottiswoode (W.). On the Sextactic Points of a Plane Curve, 653. 
T. 
Thomson (Wyville). On the Embryogeny of Antedon rosaceus, Linck ( Comatula rosacea of Lamarck), 
513. — Explanation of plates, 542. 
V. 
Velocity of light, deduction of, from electromagnetic data, 499 (see Maxwell). 
W. 
Wave-surface in biaxal crystals, 761 (see Plucker). 
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