KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM. 
PROCEEDINGS OF THE MEETING 
of Saturday June 29, 1912. 
President: Prof. H. A. Lorentz. 
Secretary: Prof. P. ZEEMAN. 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 29 Juni 1912, Dl. XXI). 
CO MN: PE NEE Ss, 
H. J. Waterman: “Mutation in Penicillium glaucum and Aspergillus niger under the action 
of known factors”. (Communicated by Prof. M. W. BEIJERINCK), p. 124. 
G. P. Frers: “On the external nose of Primates”. (Communicated by Prof. L Bork), p. 129. 
G. P. Frets: “On the Jacobson’s organ of Primates”. (Communicated by Prof. L. Bork), p. 134. 
P. Martin: “The magneto-optic Kerr-effect in ferromagnetic compounds and metals”, III. 
(Communicated by Prof. H. E. J. G. pu Bois), p. 138. 
Davin E. Rosrrts: “The effect of temperature and transverse magnetisation on the resistance 
of graphite”. (Communicated by Prof. H. E. J. G. pu Bors), p. 148. 
T. van Lonuizen: “Translation series in line-spectra”. (Communicated by Prof. P. ZEEMAN), 
p. 156. (With one plate). 
F. E. C. Scnerrer and J. P. Trevus: “Determinations of the vapour tension of nitrogen 
tetroxide”. (Communicated by Prof. J. D. van DER WAALS), p. 16. 
P. ZEEMAN and C. M. Hoocrensoom: “Electric double refraction in some artificial clouds and 
vapours”. (8rd part), p. 178. 
A. Smits: “On critical endpoints in ternary systems” If. (Communicated by Prof. A. F. 
HorLEMAN), p. 184. 
H J. Zwiers: “Researches on the orbit of the periodic comet Holmes and on the pertur- 
bations of its elliptic motion”, V. (Communicated by Prof, E. F, van DE SANDE BAKHUYZEN), 
p. 192. 
E. L. Erre: “The scale of regularity of polytopes”. (Communicated by Prof. P. H. Scnours), 
p. 200. 
A. P. N. FRANCHIMONT and J. V. Dussky: “Contribution to the knowledge of the direct 
nitration of aliphatic imino-compounds”, p. 207. 
J. BOrsEKEN and H. J. WATERMAN: “A biochemical method of preparation /-Tartaric acid”. 
(Communicated by Prof. M, W. BEIJERINCK), p. 212. 
J. BörsEKEN: “On a method for a more exact determination of the position of the hydroxyl 
groups in the polyoxycompounds” (4th Communication), (Communicated by Prof. A. F. 
HOLLEMAN), p. 216. 
G. A. F. Morencraarr: “On recent crustal movements in the island of Timor and their bearing 
on the geological history of the Hast-Indian Archipelago”, p. 224. 
Max Weser and I F. pe Beaurort: “On the freshwater fishes of Timor and Babber”, p. 235. 
W. H. Kersom: “On the deduction of the equation of state from BOLTZMANN’s entropy prin- 
ciple”. (Communicated by Prof. H. KAMERLINGH ONNES), p. 240. 
W. H. Keresom: “On the deduction from BorTzMaNN’s entropy principle of the second virial- 
coefficient for material particles (in the limit rigid spheres of central symmetry) which 
exert central forees upon each other and for rigid spheres of central symmetry containing 
an electric doublet at their centre”. (Communicated by Prof. H. KAMERLING H ONNES), p. 256. 
H. KAMERLINGH Onnes and C. A. CROMMELIN: “Isotherms of monatomic substances and of 
their binary mixtures. XIII. The empirical reduced equation of state for argon”, p. 275. 
de) 
Proceedings Royal Acad. Amsterdam. Vol. XV. 
