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; al^o 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 



