TOUCH-CORPUSCLES 427 43. PACINIAN CORPUSCLE 428 44. THE GLOTTIS 432 45. THE LARYNX IN LONGITUDINAL SECTION 433 46. THE LARYNX FROM THE RIGHT SIDE 435 NOTE ON THE FRONTISPIECE Four photomicrographs of cells or parts of cells of brain-tissue, coloured by the chrome-silver method (_cf._ p. 293). =A.= Cell of Purkinje from the cerebellum of a man aged 45. At the bottom of the photograph is seen the rounded cell-body, with the commencement of its axon. The summit of the cell-body bears an elaborately branched system of dendrites, spread out in the plane of the section. =B.= A single basket-cell of the cortex of the cerebellum (very highly magnified). The oval cell-body gives origin to four dendritic processes which branch. Thorns are to be seen on the larger process which ascends on the right. From the same process, near its origin, springs a delicate axon which thickens as it proceeds to form a basket at the right hand lower corner of the photograph. Two other branches of the same axon, which form baskets around other Purkinje-cells, are faintly visible, although out of focus. =C.= Seven or eight pyramids from the cortex of the cerebrum of a hedgehog. A little below the centre of the photograph is seen a large pyramid with a single thorny apical process which bifurcates, several basal dendrites and an axon. In the upper part of the photograph are seen the apical processes of a number of pyramids of which the bodies were not included in the section. =D.= The margin of the cortex (subiculum cornu Ammonis) from the same specimen. A single row of pyramids extends across the photograph. They are remarkable for the richness of branching of their basal processes, which has earned for the cells which comprise this sheet the name of “double pyramids.” All four sections were cut vertically to the surface. [Illustration: FIG. 2.—DIAGRAM SHOWING THE RELATIVE POSITIONS OF THE ORGANS OF THE CHEST AND ABDOMEN.