376 THE CORNEA, BY ALEXANDER ROLLETT. 



the cells of the cornea are contained. Forms also occur in the 

 corneal tissue similar to those which may be demonstrated in 

 fibrillar connective tissue, to which the proper tissue of the 

 cornea has the greatest resemblance. The developmental his- 

 tory of the two tissues have also many features in common.* 



THE CELLS OF THE CORNEA. Two kinds of cells ha ve been 

 distinguished in the cornea. 



A description of one of the forms of cells, to which little attention 

 has besn paid, was originally given by Toynbee ; f but Virchow,! in his 

 investigations first brought them so prominently into notice, that 

 since that date they have formed a rich field of research and dis* 

 cussion amongst histologists, under the name of corneal corpuscles 

 or Toynbee-Virchow's corneal corpuscles, v. Recldinghausen first 

 called attention to the presence of a second form of cell in the tissue 

 of the cornea. These will receive consideration hereafter. 



ON MIGRATING OR VAGRANT CELLS, AND ON THE INFILTRA- 

 TION OF THE CORNEA WITH SUCH CELLS. The migrating cells 

 (moving corpuscles of the cornea) || may be recognized by their 

 active amoeboid movements.^" 



They may readily be found in the cornea of the Frog, when 

 this has been recently removed from the animal as a whole, 

 and placed under the microscope with the membrane of 

 Descemet looking upwards in the aqueous humour, in a moist 

 chamber.** Their number varies in different cornese. They 

 become more sharply defined, and are seen more distinctly? 



* See this Manual, Vol. i., pp. 47, et seq., and 70. 



f- Philosophical Transactions, Part ii., p. 179, 1841. 



+ Wiirzburger Verhandlungen, Band ii. , pp. 154 and 314. Cellular 

 Pathologic. Strube, Der normale Bau dcr Hornhaut und der pathologischen 

 Abn:eichungen in demselben, (The normal structure of the cornea and its 

 pathological changes,) Dissert, inaug. "Wurzburg, 1851. 



Ueber Eiter und Bindegewebskorperchen, (On pus and connective-tissue 

 corpuscles,) Virchow's Archiv, Band xxviii., p. 157. 



|| v. Recklinghausen, loc. cit., p. 168, et seq. 



IF See this Manual, p. 54, et seq. 



** v. Recklinghausen and Engelmann, Ueber die Hornhaut des Auges, 

 (On the cornea of the eye,) p. 3, et seq. Leipzig, 1867. 



