VI C o N T K N T S. 



Cbemistry. ernst coukn: "Tlie metastubiliiy of the meUils inconsequence ofallotropy 

 and its significance for Chemistry, Physics and Technics". 632. 



— A. Smits: "The application of the theory ofallotropy to electromotive equilibria".()99. 



— H. K. Kruvt: "Pseudoternary systems of acid anhydrides and water. I. Phtalic 

 anhydride". 712. 



— J. BÖESEKEN and P. E. Verkade: "The mechanism of the acid formation of 

 aliphatic acid anhydrides in an excess of water". 718. 



— H, J. Backer: "On the nitration of methylurea". 770. 



— Ernst Couen : "AUotropy and electromotive equilibrium". 807. 



— ¥. M. Jaeger and H. S. van Klooster: "Studies in the field of silicate che- 

 mistry. I. On compounds of lithiumoxide and silica". 857. 



— A. J. VAN Peski: "On a new method of preparing carboxylic anhydrides". 'J69. 

 -- \V. P. A. JoNKEU: "Connexion between tlie adsorption-isotherm and the laws 



of Proust and Henry". 970. 



— A. Smits, A. Kettner and A. L. VV. de Gee: "Ou the pyrophoric phenomenon 

 in metals". 999. 



— A. Smits : "Answer to Prof. E. Cohen to his observations under the title of 

 "AUotropy and electromotive equilibrium". 1002. 



— W. Keinders: "The reciprocal pairs of salts KCl -f Na^O ^ NaCl + KNO3 and 

 the manufacture of conversion salpeter". 1065. 



— P. VAN KoMBURGH and Miss D. VV. Wensink : "A new hydrocarbon from the 

 pinacone of methylethylketone". 1088. 



— P. VAN RoMBURGH and P. Muller: "On 1.3.5 hexatrieue''. IÜÜO. 



— J. BÖESEKEN and J. F. Carrière : "On dichloroacetylene". 1093. 



— F. M. Jaeger : "On the isomorphy of the ethylsulphates of the metals of the 

 rare earths and on the problem of eventual morphotropic relations of these salts 

 witli analogous salts of Scandium, Indmm and Beryllium". 1095. 



— A, Smits : "The metastable continuation of the mixed crystal series of pseudo- 

 compoueuts in connection with the phenomeuon of allotropy". 1167. 



— A. Smits, S C. Bokhorst and J. W. Terwen : "9u the vapour pressure lines 

 of the system phosphorus". I. 1174. 



CUEMOTAXIS (The effect of subcutaneous terpentine-injections on the) of remote places. 609. 

 CINCHONA LEDGERiANA MOENS (Ou the presence of quinine in the seed of). 153. 

 CLOUDINESS of the sky (On the relation between the) and the duration of sunshine. 507. 

 c o n E N (e R N s T) presents a paper of Dr. P. J. H. van Ginneken : "Econoraic 

 iixiviation". 201. 



— The raetastibility of the metals in consequence of allotropy and its significance 

 for Chemistry, Physics and Technics. 632. 



— presents a paper of Dr. H. R. Kruyt: "Pseudoternary systems of acid anhy- 

 drides and water. I Phthalic anhydride". 712. 



— Allotropy and electromotive equilibrium. 807- Answer of Prof. A. Smits. 1002. 

 c o 11 E N (ernst) and G. de Bruin. On a new principle for the direct determi- 

 nation of osmotic pressure. 160. 



