SNIV CTO ND TEENS TES: 
WAALS (J. D. VAN DER) presents a paper of Prof. Pu. KounstamM and Kk. W. 
Watstra: “Measurements of isotherms of hydrogen at 20° C. and 15° C.” 203. 
— presents a paper of Mr. K. W. Waustra: “The hydrogen isotherms of 20° C, 
and of 15°.5 C. between 1 and 2200 atm.”, 217. 
— presents a paper of Prof. A. Suits: “The metastable continuation of the 
mixed crystal series of pseudo-components in connection with the phenomenon 
allotropy”. II. 672. 
— presents a paper of Prof. A. Smits and S. C. Boxuorst: “The vapour pressure 
lines of the system phosphorus”. tI. 678. III. 962. 
— presents a paper of Dr. F. E. ©. Screrrer: “On gas equilibria and a test of. 
Prof. vaN DER Waats Jr.’s formula”. I. 695. II, 1011. 
— presents a paper of Dr. F. E. C. Scnrrrer: “On unmixing in a binary system 
for which the three-phase pressure is greater than the sum of the vapour tensions 
of the components”. 834. 
— presents a paper of Prof. A, Surrs and 8. C. Boknomrst: “Further particulars 
concerning the system phosphorus”. 973. 
WAALS Jr's theorema (On gas equilibria and a test of Prof.). 1. 695. [Ls 10 Ek 
WALsTRA (Kk. W.). The hydrogen isotherms of 20° C. and of 15% C. between i 
and 2200 atm. 217. 
_— and Pu. KounstamM. Measurements of isotherms of hydrogen at 20° C, and 
15°.5 C. 203. 
WATER (The system ammonia—). 182. 
— (The system: copper sulphate, copper chlorid, potassium sulphate, potassium 
chlorid and) at 30°, 533. 
WATERLEVEL (On the relation between departures from the normal in the strength of 
the trade-winds in the Atlantic ocean and those in the) and temperature in the 
Northern European seas. 1147. 
WEBER (MAX) presents a paper of Dr. K. Kuiper Jr.: “The physiology of the 
air-bladder of fishes”, 1088. 
WEERMAN (R. A). Action of sodium hypochlorite on amides of g-oxyacids. 1163. 
weients (Combination of observations with and without conditions and determination 
of the) of the unknown quantities, derived from mechanical principles. 157. 
WENSINK (Miss p. w.) and P. van Rompurcu. On the interaction of ammonia 
and methylamine on 2.3.4.-trinitrodimethylaniline, 1034. 
WENT (F. A. F. ©.) presents a paper of Miss Lucie C. Doyer: “Energy transfor- 
mations during the germination of wheat-grains”. 62. 
— presents a paper of Dr. C. E. B, BREMEKAMP: “On the mutual influence of 
phototropic and geotropic reactions in plants”. 1278. 
WERTHEIM SALOMONSON (I. K. A.). v. SALOMONSON (I. K. A. WERTHEIM). 
WHBAT-GRAINS (Energy transformations during the germination of). 62. 
WICHMANN (A). On some rocks of the island of Taliabu (Sula islands), 226. 
— On the tin of the island of Flores. 474. 
WILDEBOER (N.), J. G. Dieperink and H. G. VAN DE SANDE BakHUYZEN. Com- 
parison of the measuring bar used in the base measurement at Stroe with the 
Dutch Metre No. 27. 300, 
