Alt — Glandular Structures Appertaining to the Human Eye. 203 



tissue which in one instance I found just below the lacrymal 

 caruncle, I have detected only one statement in literature of 

 a somewhat similar occurrence. In the text-book of A. 

 Boehm and M. von Davidoff * the following statement is 

 made (p. 349): "The third eyelid, the plica semilunaris, 

 when well developed, contains a small spicule of hyaline 

 cartilage." 



In illustrating the details of their descriptions of the eye- 

 lids, most text-books give a longitudinal (sagittal) section 

 through the thickness of the upper lid near the temporal 

 canthus. From the descriptions here given, it is clear that 

 one such drawing (not even excluding Waldeyer's often 

 copied and classical one) cannot be sufficient, as the details 

 of the tissues of the eyelids differ so very materially in their 

 different portions (Figs. 69 to 71). 



EXPLANATION OF ILLUSTRATIONS. 

 Plates XXII-LVII. 



Plate XXII. — 1, Vertical (sagittal) section through the orbital lacrymal 

 gland (A) and the more compact portion of the inferior or palpebral lacry- 

 mal gland (B), from a negro. — 2, Vertical (sagittal) section through the 

 temporal outer third of the upper eyelid and the eyeball, from a white indi- 

 vidual, showing the orbital and part of the palpebral lacrymal gland. — 3, 

 Section the same as in Fig. 2, from a negro. The magnifying power under 

 which the last two photographs were taken being the same, the great differ- 

 ence in size of the two orbital lacrymal glands is evident. 



Plate XXIII. — 4, From a negro. Section the sime as in Figs. 2 and 3, 

 but still further toward the temporal canthus, showing a large number of 

 lobules belonging to the palpebral lacrymal gland. 



Plate XXIV. — 5, Part of the palpebral lacrymal gland of Fig. 2 under a 

 higher magnifying power. Above, part of the orbital lacrymal gland ; to the 

 left, the orbicularis muscle; to the right, the conjunctiva, sclerotic and 

 choroid. The palpebral gland is seen to be separated from the orbital one 

 by the tendon of the levator palpebrae superioris and the nonstriated muscle 

 of Mueller. — 6, Vertical (sagittal) section through both eyelids at the 

 temporal canthus, showing lobules of the palpebral lacrymal gland in the 

 lower eyelid as well as in the upper one, from a negro. 



Plate XXV. — 7, Vertical (sagittal) section through the lower eyelid 

 near the temporal canthus (white), showing a Meibomian gland (A), below 

 it acino-tubular glands (B), and below these, three lobules of the lower 



* Lehrbuch der Histologic des Menschen, eiuschliesslich der mikros- 

 kopischen Technik. Wiesbaden. 1898. 



