FUNGUS FI7EMAT0DES. 143 



lisematodes, commenced in the membrana nictitans, and ex- 

 tended afterwards to one parotid gland, and to parts about the 

 under jaw. 



The mare was eighteen years old, and had had for many years 

 an ulcerated tumour on the membrana nictitans of the right eye, 

 but which did not prevent her working. Almost imperceptibly, in 

 the course of years, it had grown to the size of a pigeon's egg, and 

 nearly covered the eye. Sanious pus ran from its prominent 

 point, and, mixing with the tears, streamed down the cheek. By 

 great persuasion, M. Crepin prevailed upon her owner to let him 

 operate on her. 



On the 11th February, 1831, M. C. cast the mare, passed a thread 

 through the tumour, drew it out of the eye, and cut it off with a 

 pair of curved scissors, leaving remaining nought but the cartilage 

 from which it had grown. The mare returned to work on the fourth 

 day afterwards, the only inconvenience remaining being relaxation 

 of the lower eyelid, which, in time, was removed by cold bathing. 



From the earliest development of the tumour there had been ap- 

 parent a glandular substance underneath the jaw, which had slowly 

 increased, and at the period of the operation had reached the mag- 

 nitude of a nut, and was exceedingly hard. 



The eye continued well until the following August, when there 

 appeared at its angle a new vegetation like a small pea, which 

 grew, and in time again covered the eye entirely, and considerably 

 distended the lids, and could be felt below, extending towards the 

 bottom of the orbit. 



On the 20th February, 1832, M. Crepin extirpated this fresh 

 growth. He experienced more difficulty than before, on account 

 of numerous adhesions between the tumour and surrounding parts. 

 He succeeded, however, in isolating and excising it without doing 

 any mischief. The animal did not seem to suffer much, the opera- 

 tion being all over in little more than two minutes. The immediate 

 consequences were of no moment ; there remained a little purulent 

 discharge from the angle of the eye. On the eighth day the mare 

 returned to her work. 



But the tumour underneath the jaw had increased considerably ; 



