262 TWENTY-FO UR TH LECTURE. 



connection with the lymphatics of the nervous central organs, 

 injected from the subdural space of the brain (p. 231) an 

 intermediate space located between the external and internal 

 sheath of the optic nerve, the subvaginal space of Schwalbe 

 (s b v), and from this they drove the injection mass into the 

 perichoroideal space of Schwalbe. Schwalbe does not, how- 

 ever, accept the latter communication. 



Injection masses maybe forced beneath the inner sheath of 

 the optic nerve, between the bundles of optic-nerve fibres, 

 and this may be done from the subarachnoidal space of the 

 brain (p. 231). 



The lymphatics of the retina invest its capillaries and veins, 

 therefore, in a sheath-like manner. 



We return to the chambers of the eye, the central reservoir 

 of the lymph of the anterior portion of the globe. What is 

 the relation of its affluent passages ? 



In the first place a cleft system leads from the canal of 

 Petit into the posterior, and thus into the anterior chamber 

 of the eye. Wider and more important introductory passages 

 open from the Fontana's space in the ligamentum pectinatum 

 iridis, probably for the lymph of the iris and ciliary pro- 

 cesses. 



Injection masses pass from the periphery of the membrane 

 of Descemet into the canal of Schlemm (p. 248). 



Can a communication between the lymphatic and venous 

 passages actually exist here, similar to that which Key and 

 Retzius admitted, by the aid of the Pacchionian granulations 

 for the membranes of the brain (p. 232) ? Leber, an observer 

 who has rendered great service to the anatomy of the eye, 

 has, it is true, disputed this, and he may be right. 



We have still to mention, briefly, the external, less import- 

 ant appendices of the eyeball. 



The eyelids contain, embedded in the firm connective tis- 

 sue of the tarsal cartilage, the so-called Meibomian glands, 

 short sinuous tubes with fatty parenchyma cells, but without 

 a membrana propria or muscular tissue in the excretory duct. 

 Its secretion is the sebum palpebrale. 



