S40 
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3. Mess= Smits and pr Leeuw write:') “Why in reference to these 
experiments COHEN and GoLpscuMipT give 195° for the point of transi- 
tion in the “Chemisch Weekblad”, and 170° in the “Zeitschrift fir 
physikal. Chemie” is quite unaecountable.” The difficulty disappears 
immediately when one refers to the said paper’); it then appears 
that the following sentence has escaped Mess's Smirs and pr Lrruw’s 
notice: “Wir setzen hier vorläufig 170°, doch beatsichtigen wir auf 
die genaue Bestimmung dieser Temperatur noch später zurückzu- 
kommen. In der Figur steht irrtiimlich 195°.” *) . 
I will refer again to the transition: tetragonal tin 2 rhombic tin 
as soon as the investigations announced in my above paper shall 
be concluded. 
Utrecht, November 1912. van ‘T Hore-Laboratory. 
Physiology. — “On localised atrophy in the lateral geniculate body 
causing quadrantic hemianopsia of both the right lower fields 
of vision”. By Prof. C. WINKLER. 
(Communicated in the meeting of November 30, 1912). 
In 1904 Brervor and Corr *) observed blindness in the upper 
quadrants of both the left fields of vision by an invalid, who after 
death proved to be the bearer of a focus in the right hemisphere, 
through which the surroundings of the calcarine fissure, from the 
occipital pole to the confluence with the parieto-occipital fissure were 
destroyed. 
This observation is one of the few, in which quadrantic-hemianop- 
sia responded to a focus, which chiefly destroyed the cortex, although 
the optie radiation, as shown in the drawings of Brevor and COLLIER, 
here too was not spared in the least; on the contrary it. was des- 
troyed to an important extent (especially the medio-ventral part). 
Bervor and Cormier pointed out, that already at that time in the 
literature there was sufficient ground to suggest, that foci in the 
dorso-lateral division of the strata sagittalia of the occipital lobe can 
cause blindness in the lower quadrants of the crossed optic fields. 
On the otber hand foci in the ventro-medial division of these strata 
1) These Proc. XV, p. 677. 
2) Chem. Weekblad 1, 437 (1904), special p. 449. 
3) Zeitschr. für physikal. Chemie 50, 225 (1904), special p. 236, note 2, 
4) C. E. Beevor ano James Cottter. A contribution to the study of the cortical 
localisation. A case of quadrantic hemianopsia with pathological examination. Brain. 
1904. XXVI p. 153. 
