KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING 
of Saturday June 29, 1901. 
alte 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 29 Juni 1901, DI. X). 
Contents: “On the results of the observations of the Dutch eclipse-party”. By Dr. E. F. van 
DE SANDE BAKHUYZEN, p. 85. — “A new class of nitramines”. By Prof. A. P. N- 
FRANCHIMONT, p. 88. — “The oxidation of organic nitrogen-compounds and the 
estimation of the carbon and nitrogen therein by the moist process”. By Miss 
E. van AKEN (Communicated by Prof. A. P. N. FRANCHIMONT), p. 91. — “An 
apparatus for focussing the projecting-microscope from a distance”. By Prof. J. W. 
Morr, p. 95 (with one plate). — “A definite integral containing Bessel’s functions”. 
By Prof. W. Kaprrrn, p. 102. — “Analytical determination of the ninth point in 
which two curves of degree three, passing through eight given points, intersect each other”. 
By K. Bes (Communicated by Prof. J. CARDINAAr) p. 103. — “Precise Isothermals. 
V. The isothermal of hydrogen at 20° C. up to 60 atmospheres”. By J.C. ScHALKWIJK 
(Communicated by Prof. H. KaMERLINGH ONNES) p. 107 (with one plate). — “Expres- 
sion of the equation of state of gases and liquids by means of series”. By Prof. H. 
KAMERLINGH ONNES) p. 125. — “Plane waves of light in an homogeneous, electrically 
and magnetically anisotropic dielectric”. (2nd part). By Frep. Scaur (Communicated 
by Prof. H. A. Lorentz) p. 148. — “Vapour-tensions of mixtures of ether and 
chloroform’. By Pa. Konnxstamm and B M. van DALFSEN (Communicated by Prof. 
J. D. vaN DER WAALS) p. 156 (with one plate). 
The following papers were read: 
Astronomy. — Mr. H. G. VAN DE SANDE BAKHUYZEN president 
of the committee for the organisation of the observations 
of the solar eclipse being absent, Mr. E. F. VAN DE SANDE 
BAKHUYZEN reads a communication “on the results of the 
observations of the Dutch eclipse-party’’. 
Some days ago letters have been received from India on the 
results of the observations of the Dutch eclipse party at Karang 
Sago, and to our regret we have learned from them that the cir- 
cumstances during the eclipse have been even more unfavourable 
than we had inferred from the telegrams received. 
6 
Proceedings Royal Acad. Amsterdam. Vol. IV. 
