Alt — Glandular Structures Appertaining to the Human Eye. 205 



Plate XXXVII. — 30, The same section as shown in Fig. 29, from the 

 lower eyelid. Near the lidmargin in both of these figures a number of di- 

 lated modified sweat-glands appear as small white spots. — 31, Horizontal 

 section from near the upper edge of the tarsus of the upper eyelid, showing 

 the acino-tubular glands in the temporal side; also, a small acinous gland in 

 the conjunctiva. Below is seen the bulbar conjunctiva. 



Plate XXXVIII. — 32, Horizontal section through the tarsus of the upper 

 eyelid just above the nasal canthus. There are a number of transverse sec- 

 tions of Meibomian glands and a large compact body of acino-tubular glands 

 in the nasal part of the tarsus (A). — 33, Horizontal section through the 

 central part of the upper eyelid. In the middle line acino-tubular glands 

 are seen lying between the Meibomian glands at A. 



Plate XXXIX. — 34, Section the same as in Fig. 33, but nearer the lid- 

 margin. In the middle line, at A, a small piece of an acino-tubular gland 

 with its excretory duct is seen; also, its external orifice in the palpebral 

 conjunctiva. — 35, A similar section under a higher magnifying power. To 

 the right and left side of the acino-tubular gland a Meibomian gland is 

 seen. 



Plate XL. — 36, Vertical section through the lower eyelid, near the tem- 

 poral canthus. Downwards, the very much dilated central duct of a Mei- 

 bomian gland; above it a number of acino-tubular glands, undergoing 

 atrophy. The conjunctiva to the right shows changes due to chronic 

 blennorrhoea. — 37, Acino-tubular gland from the upper eyelid under a high 

 magnifying power. A great many acini are atrophied. 



Plate XLI. — 38, Vertical section of the upper eyelid; high magnifying 

 power. In the left lower corner the dilated apex of a Meibomian gland; 

 above it lobules of an acino-tubular gland torn apart in mounting; also an 

 excretory duct with its external orifice in the palpebral conjunctiva. The con- 

 junctival epithelium has fallen off. — 39, A concretion in the excretory duct of 

 an acino-tubular gland close to its external orifice in the palpebral conjunc- 

 tiva, the epithelium of which has fallen off. This concretion was semi-soft 

 and took up those stains with preference for which mucous substances have 

 a special affinity. 



Plate XLII. — 40, Two horizontal sections through the lidmargin. The 

 upper one, from the upper eyelid, goes through the shafts of the eyelashes; 

 the lower one, from the lower eyelid, goes through the bulbs of the eye- 

 lashes. Both sections show numerous transverse sections through Meibo- 

 mian and modified sweat-glands, as light spots. — 41, Vertical (sagittal) 

 section through the margin of the upper eyelid : A, Meibomian gland and 

 its duct; B and E, eyelashes and their sebaceous glands; C, modified sweat- 

 gland; at D, the collecting chamber and excretory duct which does not 

 enter the sebaceous gland of an eyelash, but has a separate orifice at the 

 lidmargin; at F, a part of another modified sweat-gland is seen. 



Plate XLIII. — 42, Vertical (sagittal) section through the margin of the 

 lower eyelid of a negro. To the left, the conjunctiva, tarsus and a Meibo- 

 mian gland with its excretory duct below; to the right, the skin of 

 the eyelid; downwards, an eyelash, and just above it a modified sweat-gland 

 with its secretory duct, the external orifice of which lies in the duct of a 

 sebaceous gland; above this the root of an eyelash and the orbicularis 

 muscle. Between the lower end of the Meibomian gland and the sebaceous 



