326 Proceedings of Royal Society of Edinhurgh. [mat 7, 
go messages; otherwise healthy; died suddenly from an apoplectic 
seizure. Ventricles moderately distended with fluid. Corpus callo- 
sum completely absent. Hemispheres held together only by anterior 
commissure, optic chiasma, isthmus of crura cerebri and corpora 
quadrigemina. Inner surfaces of anterior lobes of hemispheres com- 
pletely separated, parts of them in which the beak and knee of the 
corpus callosum should have been inserted covered with convolutions. 
Fornix arose from thalamus, formed corpora mammillaria ascended 
behind anterior commissure, coalesced on both sides with that part of 
the roof of the cerebral ventricles which runs just under the longi- 
tudinal convolutions, and formed with it a rounded edge. It ended 
in a normal manner posteriorly. 
II. Ward, London Medical Gazette, March 27, 1846; see Knox, 
Glasgoiv Medical Journal, April 1875. — An illegitimate child, died 
at 1 1 months ; could see and hear ; gave no indication of intelli- 
gence ; cried like a puppy. Skull twice normal thickness. No 
trace of corpus callosum, anterior, middle, or posterior commissures 
(of fornix and septum lucidum, no note). Frontal lobes flattened. 
III. Aertzliche Bericlite der Wiener Irrenanstalt filr 1853, Wien, 
1858, p. 189; see Sander, loc. cit., p. 135. — Male, 25 years, since 
20, epileptic, owing to fright; ultimately imbecile. Corpus callosum 
entirely absent. Lateral ventricles, especially in posterior horns, 
much dilated. Fornix seems to have been normal (no note about 
commissure of the body). Anterior commissure was ein diinner 
beiderseits abgerundeter, sich in ein gegeniiber-stehenden Stumpf 
endigender Balken. Nothing said about Commissura mollis. 
IV. Foerg, die Bedeutung des Balkens im menschliclien Geliirn, 
Miinchen, 1855 ; Sander, loc. cit., p. 135. — Girl, aged 17; extremely 
idiotic, muscular development very feeble. Corpus callosum absent. 
Psalterium of fornix absent, fornix otherwise normal. Fibres of 
cingulum (Zwinge) on both sides united with fornix. Presence of 
anterior commissure doubtful ; middle commissure absent. Lateral 
ventricles dilated. 
V. Poterin-Dumontel, Gaz.Med. de Paris, Uo. 2, 1863, pp. 36-38; 
see Sander, loc. cit., p. 1 35. — Man of 72 years. During the twenty-five 
years that he was under observation he had three or four apparently 
slight epileptic attacks (eblouissements passag^res avec pMeur 
de la face et resolution momentanee des membres). Very weak- 
