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33. Jonker, H. G. — »Bijdragen tot de kennis der sedimentaire zwerfsteenen 
in Nederland. 
TI, De Hondsrug in de provincie Groningen. 
2. Bovensilurische zwerfsteenen. 
Eerste mededeeling: Zwerfsteenen van den ouderdom 
der oostbaltische zone G”. 
Versl. v. d. gew. Verg. d. Wis- en Nat. Afd. d. Kon. Ak. v. W. v. 28 Jan. 
1905, dl. XU, 2. p. 548—565. 
Groningen, Min.-Geol. Institute, April 4, 1905. 
Anatomy. — “Note on the Ganglion vomeronasale.” By E. pr Vrins. 
(Communicated by Prof. T. Pracr.) 
The deseription and drawings given in this note derive from a 
wellpreserved human embryo. This embryo was fixed in a ten 
percent solution of formaldehyde. After fixation the greatest diameter 
was 55 mm. Precise information as to the probable age of this 
embryo was not to be obtained, but the dimension of the embryo in 
connexion with the fact, that the corpus callosum was not yet 
formed, makes it probable that the age of the embryo may be 
estimated between 2'/, and 3 months. 
After the embryo being hardened in alcohol the head was cut off 
along the base of the crane and imbedded in paraffin; a complete 
series of frontal sections of 10 u was made. A slight deviation from 
the frontal plane existed, so that the top of the right hemisphere 
first appeared in these sections. The greatest part was stained in 
haematoxylin and eosine in the usual manner, the rest of the sections 
with haematoxylin only, in slightly different ways. 
A description is given of the right hemisphere, — which in the 
microscopical sections corresponds with the left one —, concerning 
only that part which has a closer relation to the rhinencephalon. 
This description is illustrated by four drawings of successive sections 
and by two semi-diagrammatic figures. 
These figures (Fig. V, VI) are a projection of the olfactory lobe 
on a sagittal plane and constructed from the series of sections. 
Because the plane upon which the projection is performed is sagittal, 
only these curvatures of the olfactory lobe are seen, which have a 
component in that direction. The lines in these drawings denoted 
from I to IV indicate the place of the four sections marked with 
a corresponding roman number. 
The olfactory lobe, as seen in this stage of development, forms 
