XXII CONTENTS. 
SUBSTANCES (A new relation between the critical quantities and on the unity of all) 
in their thermic behaviour. 451. 
SUBSTITUENTS (The replacement of) in benzene derivatives. 1027. 
2-SULPIIO-PROPIONIC AcrD and its resolution into optically active isomerides. 653. 
SULPHUR DIOXIDE (A crystallized compound of isoprene with). 585. 
SUNLIGHT (Action of) on the cinnamic acids. 1274. 
system P/-S-O (Equilibria in the), the roasting reaction process. 703. 
— (The) copper sulphate, copper chlorid, potassium sulphate, potassium chlorid and 
water at 30° C. 533. 
— (Characteristic numbers for a triply infinite) of algebraic plane curves. 1055. 
— ammonia—water (The). 182. 
— ethane—naphthalene (On critical endpoints and the), 1095. 
— phosphorus (On the vapour pressure lines in the). I. 678. [IL, 962. 
— phosphorus (further particulars concerning the). 973. 
TALIABU (Sula islands) (On some rocks of the island of). 226. 
TEMPERATURE (On the relation between departures from the normal in the strength 
of the trade-winds of the Atlantic Ocean and those in the waterlevel and) in 
the Northern European seas. 1147. 
TEMPERATURE-COEFFICIENTS (The) of the free energy surface of liquids at tempera- 
tures from —80° C. to 16509 C. I. 329. IL. 365. ILL. 386. LV. 395. V. 405, 
VE. 416. VEL +655; VET 571. 
TEMPERATURES (The measurement of very low). XXIV. The hydrogen and helium 
thermometers of constant volume down to the freezing point of hydrogen com. 
pared with each other and with the platinum-resistance thermometer. 501. 
— (The specific heat at low). I. Measurements on the specific heat of lead between 
14° and 80° K. and of copper between 15° and 22° K. 894. 
TENDONFIBRES (On the mode of attachment of the muscular fibre to its) in the striated 
muscles of the vertebrates. 989. 
TERNARY SYSTEMS (Equilibria in). XV. 70. XVL. 169. XVIL 767. XVIII. 1260. 
TETRODE (u.). Theoretical determination of the entropy constant of gases and liquids, 1167. 
THEORY of allotropy (The application of the) to electromotive equilibria. II. 37. III. 680. 
— of Bravars (The) (on errors in space) for polydimensional space with applica- 
tions to correlation. (Continuation). 150. 
— (The) of the combination of observations and the determination of the precision, 
illustrated by means of vectors. 490. 
— of combinations (Simplified deduction of the formula from the) which PLanck 
uses as the basis of his radiation theory. 870. 
— of corresponding states (Contribution to the). $40. 
— of gravitation (On the field of a single centre in ErNsTEIN's). 993. 
THERMOMETERS (The hydrogen and helium) of constant volume, down to the freezing 
point of hydrogen compared with each other, and with the platinum-resistan ce 
thermometer, 501. 
TURDE-PHASE PRESSURE (On unmixing in a binary system for which the) is greater 
than the sum of the vapour tensions of the two components, 834, 
