194 Trails. Acad. Sci. of St. Louis. 



of the eyelid on account of its curvature, but they often com- 

 prise about half or a little more of an eyelid. For the same 

 reason, that is, the curvature of the eyelid, these sections can 

 only in an approximate way be said to run parallel to the 

 surface of the eyelid.) 



Near the canthi where the eyelashes cease, I find, as a rule, 

 a larger body of these glandular structures lying outside of 

 the last eyelash, temporally as well as nasally. 



These peculiar glands usually appear to consist of one or 

 two rows of round or oval vesicle-like acini, which are some- 

 times quite large, and which probably communicate with each 

 other (Figs. 44, 45). Half a dozen or so of such acini 

 seem to constitute the gland. These usuallv terminate in one 

 larger, more conically shaped acinus, a collecting chamber, 

 from which the efferent duct of the gland takes its origin. 

 While this arrangement is the one I have almost always found, 

 I have now and then seen a gland which appeared to be alto- 

 gether tubular, the tube being wound upon itself exactly as is 

 the case with the sweat-glands of the skin (Figs. 42, 46). 

 As this usually occurred in thicker sections it may, perhaps, 

 be that the appearance I have above described, is due to the 

 manner in which the section has cut through the windings 

 of the tube, and that in reality we have to deal altogether 

 with tubular glands. I have been unable to come to a definite 

 conclusion as regards this point. 



The efferent duct of these glands usually has a slightly 

 arched course on its way to the lidmargin (Figs. 41, 42). 

 There its orifice lies frequently within the duct of one of the 

 sebaceous glands belonging to an e} r elash. There are, how- 

 ever, many exceptions to this general rule, and I have found 

 in almost every eyelid a number of external orifices of effer- 

 ent ducts of modified sweat-glands which lie separately in 

 the skin of the lidmargin. 



The acini of these peculiar glands are lined with a short, 

 almost cuboid cylindrical epithelium ; the epithelial cells lining 

 the efferent ducts appear more flattened. 



I have frequently seen a fatty, grumous substance contained 

 in the lumen of the acini of these glands which appeared 

 exactly like the contents found in the acini of the Meibomian 



