KONINKLIJKE AKADEMIE VAN WEDENSCHAEPIN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING 
of Saturday October 28th, 1899. 
IUC 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 28 October 1899 Dl. VIII). 
Contents: “On Isodialdane”. By Prof. C. A. Lopry pe Bruyn and Mr. H.C. Byt, p. 143.— 
“Mixed Crystals of Mercury Iodide and Bromide.” By Prof. H. W. Baxnuis RoozeBoom, 
p. 146. — “On the Enantiotropy of Tin (ID). By Dr. Ernsr COHEN and Dr. C. van 
Erk (Communicated by Prof. H. W. Baknuis RoozeBoom), p. 149, — “On a new 
kind of Transition Elements (sixth kind)”. By Dr. Ernst Comer (Communicated by 
Prof. H. W. Baxuuis RoozreBoom), p. 153. — “On mixed Crystals of Sodium nitrate 
with Potassium nitrate and of Sodium nitrate with Silver nitrate”. By Prof. H. W. Bakuuis 
RoozeBoom, p. 158. — “The Nature of inactive Carvoxime”. By Prof. H. W. Baxuuis 
RoozeBoom, p. 160..— “On Isomorphous Compounds of Gold and Mercury”. By Prof. 
Tu. H. Benrens, p. 163. — “A Remark on the Molecular Potential Function of Prof. 
VAN DER Waars”. By Dr. G, BAKKER (Communicated by Prof. J.D. van DER WAALS), 
p. 163. — “Tidal Constants in the Lampong- and Sabangbay”. By Dr. J.P. van DER STOK, 
p. 178. — “On the Relation of the mean Sea-level and the Height of Half-Tide.” By Mr« 
H. E. pe Bruty, (with 2 plates) p. 189. — “New Theorems on the Root of the Functions 
A (z)”. By Prof. L. GEGRNBAUER (Communicated by Prof. JAN DE VRIES), p. 196. — 
“Spasms in the Terrestrial Magnetic Force at Batavia”, By Dr. W. vAN BEMMELEN 
(Communicated by Prof. KAMERLINGH ONNES), p. 202. — “The dielectric Coefficients 
of liquid Nitrous Oxide and Oxygen”. By Dr. Frirz HAZENOEHRL (Communicated by 
Prof. H. KAMERLINGH Onnes) (with one plate), p. 211. — “The Harr-Effect and the 
increase of Magnetic resistance in Bismuth in very low Temperatures.” By Dr, E. van 
EvERDINGEN JR. (Communicated by Prof. H. KAMERLINGH ONNES), p. 228. 
The following papers were read: 
Chemistry. — ‘On Jsodialdane.” By Prof. C. A. LOBRY DE Bruyn 
and Mr. H. C, But. 
(Read in the meeting of September 30th 1899), 
In his interesting and prolonged researches on aldole, Wurtz has 
described two condensation products of this substance, formed by 
the separation of a molecule of water from two molecules of aldole, 
One of these, dialdane, which is formed along with aldole from 
eee EL 
Proceedings Royal Acad. Amsterdam. Vol. IL. 
