378 THE CORNEA, BY ALEXANDER ROLLETT. 



with pus possess the same mobility, and that similar but sparingly 

 distributed amoaboid cells occur also as migrating cells even in the 

 healthy cornea.* 



We must not omit, in an account of the cornea, to enter into special 

 details in regard to the mode of origin of the amoeboid cells met with 

 in purulent infiltration of the cornea, since, as we shall hereafter see, 

 the researches on this subject play an important part in the con- 

 troversies on the peculiarities and the significance of that form of 

 cell in the cornea which was formerly characterized as corneal cor- 

 puscles or as Toynbee-Virchow corneal corpuscles. 



I desire in the first place to call attention to the appearances which 

 may have been considered to show that the haziness of the cornea in 

 traumatic inflammation is due to a proliferation of the cells (nuclei) 

 contained in the cornea. f 



When the examination of the corpuscles of the cornea began to 

 be more carefully considered, attempts were made to ascertain the 

 nature of the changes occurring in it in inflammation ; { and through 

 such examinations continued by His, Weber, || Rindfleisch,^[ Lang- 

 hans,** it was endeavoured to give a more detailed expression of the 

 view of the origin of the pus corpuscles from the corpuscles of the 

 cornea. Lastly, after the amoeboid character of migrating cells had 

 been established, it was pointed out how those of the cornea, either 

 directly or owing to the division of the cells, could undergo conversion 

 into such migrating cells. ft 



It was shown at the same time that the corneas of various animals 

 exstirpated whilst still living, or just after death, and which had been 



* v. Recklinghausen, loc. cit., pp. 157 171. 



t Bowman, Lectures on the parts concerned in the operations on the 

 Eye and on the structure of the Retina, p. 29, fig. 5. London, 1849. 



I Yirchow, Ueber parenchymatose Entziindung, (On parenchymatous 

 inflammation,) Virchow's Archiv, Band iv., p. 259. Strube, lac. cit. 



Beitrdge zur normalen und pathologischen Histologie der Hornhaut, 

 (Essays on the normal and pathological histology of the cornea,) p. 45. 

 Basel, 1856. 



|| Zur Entwickelungsgeschichte des Eiters, (On the mode of development 

 of pus,) Virchow's Archiv, Band xv., p. 475. 



IF Untersuchungen iiber die Entstehung des Eiters, (Researches on the 

 origin of Pus,) Virchow's Archiv, Band xvii., p. 239. 



** Das Gewebe der Hornhaut in normalen und pathologischen Zustdnde, 

 (The normal and pathological conditions of the cornea,) Zeitschrift fur 

 rationelle Medicin, 3 Reihe, Band xii., p. 22. 



tf v. Recklinghausen, loc. cit., p. 181. 



