200 Macteay Memoria Vouume. 
Fig. 13.—Photo-micrograph of horizontal transverse section of rod-organ in its deeper half. Anilin blue 
black stain. Beck’s } inch objective, without ocular. x 200 diameters. The rod, here in its 
deeper half, is completely surrounded by the dermal tissues. Note the central axial group 
surrounded, at some distance, by the circlet of the peripheral set of nerve-fibrils, all appearing 
as white dots. 
PLATE XxXVI. 
Fig. 14.—Outline drawing to serve as key to photo-micrograph, fig. 1, Plate xx1v. 
Fig. 15.—Semi-diagrammatic representation of the constituent elements of the shaft of a rod-like organ. 
e., cells of general epidermis slightly modified and forming a kind of follicle; p., outermost 
layer of shaft formed of large polyhedral cells; m., layer of imbricated flattened cells with 
deeply-staining nuclei, which are transversely elongated, see fig. 6, Plate xxiv. ; c., hollow 
truncated conical epithelial amine formed by fusion of nucleated epithelial cells. These 
peculiar elements are shown in optical section, as from the inside, as well as in sectional profile. 
ps: represents one of the peripheral circles of terminal nerve-fibrils ; a,f. represents one of the 
axial systems or groups of terminal nerve-fibrils. Observe that the varicosities regularly 
alternate with the epithelial lamine. 
Fig. 16.—Diagrammatic representation of the superimposed truncated conical epithelial laminz which 
make up the core of the rod. c., conical lamine, nucleated ; a.f., axial group of nerve-tibrils. 
Fig. 17.—Drawing of teased elements from core of rod-like organ. Stained hematoxylin and eosin. 
x 300 diameters. c., conical epithelial lamina; 7., one of its nuclei; m, one cell of the 
imbricated layer (m. in figs. 6 and 15). 
Fig. 18.—Transverse section through extreme base of rod-like organ. Anilin blue-black stain. x 250 
diameters. /., “lenticular bodies”; P., tip of a Pacinian-like body; w., meduilated nerve- 
fibres ; d., ensheathing dermal tissue. 
= 
fo) 
. 19.— Vertical section of basal part of rod-like organ and its nerve apparatus. Freud’s gold chloride 
stain, x 820 diameters. Shows medullated nerve-fibres in lower part of drawing, ascending 
tortuously towards the base of the rod. Two Pacinian-like bodies are seen beneath the flat 
rod base and two “lenticular bodies,” one with a nerve-fibre joining it is seen amid the 
epithelial cells of the base of the rod. In addition two medullated nerve-fibres are seen to 
enter the side of the base and, losing their white sheaths, they give origin to terminal fibrils of 
the peripheral circlet. 
Fig. 20.—Semi-diagrammatic representation of a ‘“ lenticular” nerve end-organ, with nerve-fibre joining it. 
x 1300 diameters. v., vesicular cell-like structures; sh., sheath, continuous with neurilemma ; 
nu., flattened nuclei in sheath; me., disk or meniscus continuous with axis-cylinder of nerve- 
fibre ; aw., axis-cylinder of nerve-fibre ; w., medullary sheath of nerve-fibre. 
Fig. 21.—Vertical section rod-like organ. Freud’s gold chloride stain. Shows nerve-apparatus, including 
Pacinian-like and “lenticular” bodies, and axial and peripheral systems of terminal fibrils. 
y., nerve-tibres extending upwards, the tissues of dermis in cleft between rod and general 
epidermis. 
Fig. 22.—Drawing of same section as that represented in fig. 12, Pl. xxv. Hematoxylin stain. Zeiss’ 
apochrom. objective 4mm., compens. ocular No. 6. x 400 diameters. The fibrils are as 
distinct in the specimen as in this drawing, but they are not black but only highly refracting. 
