332 Proceedings of Royal Society of Edinhurgh. [mat 7, 
XVIII. Sander, loc. cit, p. 303. — Microcephalic brain. Corpus 
callosum short, splenium thin : no further examination allowed. 
XIX. Paget, Med. Cliir. Trans.., 1846, p. 55, fig. 15. — Girl, 21; 
mental condition fairly normal ; showed merely want of forethought, 
some flightiness of manner, but had a good memory, was trusty and 
competent, and of good character. Convolutions normal, corpus 
callosum 1’4 inch long, anterior margin 1*9 inch from tip of frontal 
lobe, posterior 3*7 inches from occipital lobe; length 1 inch in middle 
line, increases in length as it proceeds outwardly. Fibres of anterior 
part — continued into frontal lobes fibres of middle part — a few 
fibres pass transversely from one hemisphere to another ; most 
pass with varying degrees of obliquity, most of the oblique bands 
pass from left to right — these in the left side being thicker. There 
is not, in their usual position, a trace of the septum lucidum or 
middle part of the fornix. The tapetum present, psalterium of 
fornix absent ; fornix, anterior and posterior commissure normal, 
middle commissure very large (fig. 15). 
XX. Jolly, Zeitschrift f. rationelle Medicin, Bd. xxxvi., 1869. 
(The same case is described by Nobiling, Baier. Aertz. Intelligenzbl., 
24, or Jahreshericht fiir Medicin, 1859, p. 153, quoted by Knox, loc. 
cit.). — Eailway servant, died 58, of cancer of stomach. Mental 
power normal, brain of normal size, convolutions of both hemi- 
spheres well developed ; corpus callosum length 2 ’8 cm. (about 1 
inch) ; knee is 1'9 cm. thick; the body varied from IT to 12 cm. 
thick ; the posterior rudiment of the splenium 0*6 cm. ; distance 
of knee from tip of frontal lobe 4*7 cm., of posterior margin from 
tip of occipital lobe is 8*5 cm. Psalterium of fornix absent, fornix 
present (rudimentary), ventricle dilated, ependyma thickened ; an- 
terior commissure apparently present, middle commissure absent, 
cornu ammonis normal. (It would have been interesting to know 
how far forwards it extended, and what was the condition of the 
fascia dentata and nerve of Lancisi.) 
XXI. Chatto, London Med. Gazette, i., 1845. — Child, year old ; 
epileptic (daily fits) ; in all its life manifested no sign whatever of 
recognising persons or objects. Corpus callosum represented by 
two thin strands, a few lines broad, uniting the anterior parts of the 
hemispheres ; psalterium of fornix absent, septum lucidum also 
absent (fornix itself presumably present). No note of condition of 
