KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING 
of Saturday September 28, 1901. 
DOGS 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 28 September 1901, Dl. X). 
Contents: “On the influence of the position of atomgroups in aromatic compounds on the process of 
the reactions”. By Prof. S. Hoogewerrr and Dr. W. A. van Dorp, p. 161. — “On 
the Gastrulation and the Formation of the Mesoblast in Mammals”. By Prof. A. A. 
W. Husrecur, p. 161. — “The negative-inotropic influence of the nervus vagus on 
the heart”. By Prof. Ta. W. ENGELMANN, p. 162. — “Investigations with the Micro- 
manometer”. By Dr. A. Suits (Communicated by Prof. V. A. Juuus), p. 163. — 
“On the Theory of the biquadratic Rest”. By Prof. L. GEGENBAUER (Communicated 
by Prof. Jan DE Vries), p. 169. — “The number of conics intersecting eight given 
right lines”. By Prof. Jan pe Vries, p.181. — “On the irritable stigmas of Torenia 
Fournieri and Mimulus luteus and on means to prevent the germination of foreign 
pollen on the stigma”. By Dr. W. Burck, p. 184. — “On the origin of double lines 
in the spectrum of the chromosphere, due to anomalous dispersion of the light from 
the photosphere”. By Prof. W. H. Jurrius, p. 193, (with one plate). 
The following papers were read: 
Chemistry. — “On the influence of the position of atomgroups in 
aromatic compounds on the process of the reactions’. By 
Prof. 5. HOOGEWERFF and Dr. W. A. van Dorp. 
Zoology. — “On the Gastrulation and the formation of the Meso- 
blast in Mammals”. By Prof. A. A. W. Huprecat. 
Dr. Husprecut circulates and explains eleven plates that have 
been executed for a memoir on the ontogeny of Tarsius spectrum 
intended for Vol. VIII of the Transactions of the Academy. 
He calls attention to certain theoretical conclusions concerning 
the gastrulation and the formation of mesoblast in mammals which 
appear in a different light now that we have become acquainted 
with the facts recorded in that memoir. 
He expresses a wish to add certain woodcuts to the text, but is 
informed by the President and Secretary that for the present the 
publication of this memoir will have to be postponed. 
ki 
Proceedings Royal Acad. Amsterdam. Vol. IV. 
