50 



Drs. L. Mond. W. Ramsay, and J. Shields. 



adapts with the Whales, in the elongation of the anterior part of the 

 brain-cavity, corresponding to the tractus, no instance of a similar 

 reptilian-like conformation of the brain is known to me amongst 

 Mammalia, if I except the Amblypoda, especially the Dinoceratida?., 

 the brain of which " was proportionally smaller than in any other 

 known Mammal, recent or fossil, and even less than in some reptiles. 

 It was, indeed, the most reptilian brain in any known Mammal. . . . 

 The cerebral hemispheres did not extend at all over the cerebellum 

 or the olfactory lobes."* 



EXPLANATION OF PLATE. 



FlGS. 1 — 3. — Figures of cast of brain-cavity of Globilemur Flacourti, Major, 

 Pleistocene, near Nossi-Ye, S.W. Madagascar. Original specimen pre- 

 served in the Uritish Museum (Natural History). 2/3rds natural size. 

 Fig. 1. — "View of brain, seen from above. 



,, 2. — Side view of same (s.f., Sylvian fissure). 



„ 3. — "View of same, seen from beneath (o.n., optic nerve). All drawn 

 2/3rds natural size. 



Figs. 4 — 6. — Figures of cast of the brain-cavity of Megaladapis madagascariensis, 

 Major (2/3rds natural size) ; Pleistocene, Ambouhsatra, S.W. Mada- 

 gascar. 



Fig. 4. — View of brain, seen from above (b, beak-like projection in front) . 

 „ 5. — Side view of same. 



„ 6. — View of same, seen from beneath (o.n., optic nerve). All drawn 2/3rc!s- 

 natural size. 



Fig. 7. — Brain of Indris (seen from beneath), recent {o.n., optic nerve) ; copied 

 from Grandidier. 



„ 8. — Brain of Alligator (seen from beneath), recent (o.n., optic nerve). 



" On the Occlusion of Oxygen and Hydrogen by Platinum 

 Black. Part II." By Ludwig Mond, Ph.D., F.R.S., 

 William Kamsay, Ph.D., F.K.S., and John Shields, D.Se.> 

 Ph.D. Received July 21, 1897. 



(Abstract.) 



The heat of occlusion of hydrogen in platinum black was deter- 

 mined by saturating the platinum black with hydrogen, extracting* 

 as much of this as possible at 184° C. by means of the pump, and 

 then readmitting it again whilst the experimental tube was placed in 

 an ice calorimeter. By proceeding in this way, errors due to the pre- 

 existence of oxygen in the platinum black were avoided, and it was 



* O. C. Marsh, " Dinocerata. A Monograph of an extinct Order of gigantic 

 Mammals," ' Monographs of the United States Geological Survey,' vol. 10, Wash- 

 ington, 1886, pp. 53, 54. 



