GONTENTS. Vv 
Chemistry. A. P. N. FRANCHIMONT and H. J. Backer: “The coloration of some deri- 
vatives of Picrylmethylamide with alkalies”. 647. 
— A. P. N. FRANCHIMONT and H. J. Backer: “a Sulpho-propionic acid and its 
resolution into optically active isomerides’”. 653. 
— A. Smits: “The metastable continuation of the mixed crystal series of pseudo- 
components in connection with the phenomenon allotropy”. [L. 672. 
— A. Smits and S. C. Bokuorst: “On the vapour pressure lines of the system 
phosphorus”. [L, 678. 
— F. E. C. Scuzrrer: “On gas equilibria and a test of Prof. v. p. Waars Jr.s 
formula”, I. 695. If. 1011. 
— W. Rerypers; “Equilibria in the system Pb-S-O, the roasting reaction 
process”. 703. 
— F. A. H. ScHREINEMAKERS and Miss W. C. pr Baar: “On the quaternary 
system KCl-CuClo-BaClp-H,0”. 781 
— Ernst Conen and W. D. Heiperman: “The allotropy of lead”. 822. Note. 1055. 
— A. F. HOLLEMAN: “The nitration of the mixed dihalogenbenzenes”. 846, 
— J. BÖEsSEKEN and W. D. Conen: “The reduction of aromatic ketones. III. Contri- 
bution to the knowledge of the photo-chemical phenomena’’. 849. 
— Ernst COHEN and G. bE Bruin: “The metastability of the metals in cons>- 
quence of allotropy and its significance for Chemistry, Physics and Technics’. 
Il]. 926. 
— A. Smits and 8. ©. Bokuorst: “On the vapour pressure lines of the system 
phosphorus”. IL. 678. ILL. 962. 
— A. Smits and 8. C. Boxnorst: “Further particulars concerning the system 
phosphorus”. 973. 
— A. F. HorLEMAN : “The replacement of substituents in benzene derivatives’’. 1027. 
— P. van RomBureu and Miss D. W. Wensinx: “On the interaction of ammonia 
and methylamine on 2.3.4.-trinitrodimethylaniline”. 1034. 
— C, H. Suuirer: “The influence of the hydration and of the deviations from the 
ideal gas-laws in aqueous solutions of salts on the solidifying and the boiling 
points”. 1036. 
— Miss Apa Prins: “On critical end-points and the system ethanenaphtalene” 1095. 
— F. A. H. Scutreinemakers and Miss W.C. pe Baat: “Compounds of the 
arsenious oxyde”. 1111. 
— Ernst Conen and S. Worrr: “The allotropy of potassium”. I. 1115. 
— H. R. Kruyt and Jac. van DER SPEK: ‘“‘The connection between the limit 
value and the concentration of arsenic trisulphide sols”. 1158. 
— R. A. WEERMAN: “Action of sodium hypochlorite on amides of g-oxyacids’’. 1163, 
— F. M. Jagcer: “Researches on Pasreur’s principle of the connection between 
molecular and physical dissymmetry”’. 1. 1217. 
— Ernst Conen: “The allotropy of bismuth”. [L. 1236. 
— Erwst COHEN and W. D. HELDERMAN: “The metastability of the metals in 
consequence of allotropy and its significance for Chemistry, Physics and Tech- 
nics”, IV. 1238. 
