206 Trans. Acad. Sci. of St. Louis. 



gland lies Riolan's muscle. — 43, Horizontal section through the lidmargin 

 at the level of the roots of the eyelashes, showing numerous transverse 

 sections of hair-bulbs and between them modified sweat-glands. Down- 

 wards the transverse sections of three Meibomian glands near their lower 

 end. The fibres seen running parallel to the conjunctival surface above the 

 Meibomian glands and those between the modified sweat-glands and the hair- 

 bulbs are the fibres of Riolan's muscle. 



Plate XLIV. — 44,45, Vertical sections, parallel to the surface, through 

 the lid margins of the upper and lower eyelid, showing the modified sweat- 

 gland and (abnormally dilated), between, the roots and shafts of the eye- 

 lashes, under a high magnifying power. 



Plate XLV. — 46, Section the same as in Figs. 44 and 45, showing at A, 

 B and C modified sweat-glands under a high power, having an altogether 

 tubular appearance; above them are some acini of a Meibomian gland. — 47, 

 Horizontal section through the lacrymal caruncle of a negro, showing 

 sebaceous glands, the transverse section of a hair (upwards) and an acinous 

 gland at A. 



Plate XLVI. — 48, Vertical section through a lacrymal caruncle having 

 two acinous glands (A and B). The epithelium has fallen off. — 49, Hori- 

 zontal section through the lacrymal caruncle. Acinous glands at A, 



Plate XLVII. — 50, Similar section to that shown in Fig. 49. — 51, Small 

 body of hyaline cartilage lying in the loose tissue (in one lid only) of the 

 lower eyelid, just below the caruncle. Horizontal section. The conjunc- 

 tival epithelium has fallen off. 



Plate XLVII1. — 52, This cartilage under a high magnifying power. — 

 53, Vertical (sagittal) section through both eyelids passing through the 

 vertical portion of the lacrymal canaliculus of the upper eyelid and its 

 orifice in the lacrymal papilla. The oblique section through the horizontal 

 portion of the canaliculus is seen in the lower eyelid. The canaliculus is 

 filled with desquamated epithelium. 



Plate XLIX. — 54, Horizontal section through the upper eyelid showing 

 the horizontal portion of the lacrymal canaliculus. Below is the lacrymal 

 caruncle. — 55, Section through the axis of the lacrymal papilla and the 

 vertical portion of the lacrymal canaliculus, showing its narrowest part just 

 inside of the lacrymal punctum, from where it widens out gradually to where 

 it bends to form the horizontal portion. 



Plate L. — 56, Section like the one in Fig. 55. To the left the horizontal 

 diverticle of the lacrymal canaliculus projects into the tissue of the eyelid 

 (temporally) , to the right (nasally) the beginning of the horizontal portion. 

 This section does not pass exactly through the axis of the vertical portion 

 of the canaliculus. — 57, Horizontal section showing a tortuous lacrymal 

 canaliculus. 



Plate LI. — 58, Section through both eyelids and nasal canthus almost 

 parallel to their surface. To the left and downwards, nasal part of the 

 upper, to the right and upwards, nasal part of the lower eyelid ; between these 

 the lacrymal caruncle. At the right the horizontal portions of the two can- 

 aliculi are seen to join at a sharp angle. — 59, The entrance of the lacrymal 

 canaliculus into the lacrymal sac. The canaliculus lies to the right and is 

 seen to be lined with a thick pavement epithelium ; the lacrymal sac to the 

 left is lined with cylindrical epithelium. 



