XII OPO Ne DEE N tas. 
Liquips (On the different forms and transformations of the boundary-curves in the 
case of partial miscibility of two). 636. 
LOBRY DE BRUYN (C. A.) presents a paper of Dr. J. J. BLANKsMA: “On the 
intramolecular oxydation of a SH-group bound to benzol by an orthostanding 
NO»-group”. 63. 
— presents a paper of J. M. M. Dormaar: “The inversion of carvon and eucarvon 
in carvacrol and its velocity”. 63. 
— presents a paper of J. Om Jr: “The transformation of the phenylpotassium 
sulphate into p. phenylsulphonate of potassium”: 328. 
— presents a paper of J. F. Suyver: “The intramolecular transformation in the 
stereoisomeric 2- and Z-trithioacet and z- and £-trithiobenzaldehydes”. 329. 
— presents a paper of J. W. Dito: “The viscosity of the system hydrazine and 
water”. 329. 
— and S. Tymstra Bz. The mechanism of the salicylacid synthese. 63. 
LONGITUDE of St. Denis (Island of Réunion) (A short account of the determination 
of the) executed in 1874, 602. 
LORENTZ (H. A.) presents a paper of Prof. A. SOMMERFELD: “Simplified deduction 
of the field and the forces of an electron moving in any given way”. 346. 
— The motion of electrons in metallic bodies. I. 438. If. 585. IIL. 684. 
— presents a paper of J. J. van Laar: “On some phenomena, which can occur 
in the case of partial miscibility of two liquids, one of them being anomalous 
specially water”. 517. 
— presents a paper of J. J. van Laar: “An exact expression for the course of 
the spinodal curves and of their plaitpoints for all temperatures, in the case of 
mixtures of normal substances”. 646. 
MAIN PLAIT (The transformation of a branch plait into a) and vice versa. 621. 
MARCKWALD’s (On W) asymmetric synthesis of optically active valeric acid. 465, 
MARTIN (K.) presents a paper of Prof. Eva, Dupors: “On an equivalent of the 
Cromer-Forest-Bed in the Netherlands”. 214, 
— presents a paper of Dr. H. G. Jonker: “Contributions to the knowledge of 
the sedimentary boulders in the Netherlands. 1. The Hondsrug in the province 
of Groningen. 2. Upper Silurian boulders, 1st Communication: Boulders of the 
age of, the eastern Baltic Zone G@”. 560. 2nd Communication: “Boulders of the 
age of the eastern Baltic Zones H and J”, 692. 
Mathematics. Frep. Scuuu. “On an expression for the class of an algebraic plane 
curve with higher singularities”. 42, 
— Epm. Lanpau: Remarks on the paper of Mr. Kiuyver: “Series derived from 
mm 
the series tlm)» 66. 
mm 
— Frep. Scuun: “On an expression for the genus of an algebraic plane curve 
with higher singularities’. 107. 
— Frep. Scuun: “On the curves of a pencil touching an algebraic plane curve 
with higher singularities’. 112. 
— J. C. Kruxrver: “Evaluation of two definite integrals”. 201. 
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