324 Dr. Macartney on the Structure of the Brain in the Chimpanzee and 



missure was particularly strong, and held distinct white filaments. The linea 

 semilunaris was faintly marked. The two anterior of the tubercula quadrigemina, 

 called nates, were the smaller. The fourth ventricle was much prolonged into 

 the lateral lobes of the cerebellum. The grey substance on the floor of the ven- 

 tricle was not raised into the appearance of two ganglia, and there were no white 

 stria. The sentient or white filaments formed looser or less complicated plexuses, 

 wherever they were examined, than in man, and I could not discover any of the 

 delicate arborescent filaments in the base of the corpora striata. 



DISSECTION OF A FEMALE IDIOT, WITH EXTRAORDINARY BRAIN. 



The whole mass of the brain was small, but the front part did not recede. The 

 convolutions were rather small, but sufficiently deep for the size of the brain. 

 The lobes of the cerebellum were not the one-third of the usual size. The gyri 

 were scarcely distinguishable, and the divisions were few and shallow. The arbor 

 vitce had but two principal branches, and the sub-divisions of these were few. 

 The anterior part of the lobes was supplied by two clusters of membranous cells, 

 filled with red jelly or albuminous fluid, such as we find substituted for the 

 brain in acephalous foetuses. The corpus fimbriatum was indistinct, wanted the 

 denticulated margin, and the proper structure interiorly, and was not half the 

 proper size. The pons was exceedingly small, and its internal structure obscure. 

 The pyramids were parallel cylindric forms, and did not appear to decussate. The 

 corpora olivaria had little prominence, and the coloured substance was deficient. 

 The locus niger was imperfectly formed, and not of a dark colour. The corpora 

 striata were very small, as also the white filaments contained in them. The pineal 

 gland was rather of a large size, and contained a cluster of round soft bodies, in 

 place of the calcareous granules. In fine, the character of the whole brain was 

 imperfection of intimate structure. The plexuses were not intricate, and the 

 grey substances pale, and not in sufficient quantity. This person had been a 

 patient in the Whitworth Hospital. The account I received of the state of her 

 intellect from the house pupil was, that she was foolish, and that he could never 

 get a rational answer from her. She was extremely ugly, with projecting jaws 

 and teeth, and an idiotic countenance. She was an unmarried woman, but not a 

 virgin, notwithstanding the great deficiency in her organ of amativeness. 



