OVINAI'IUN OF A SlIKKl*. 37 



results, and also to prove whether the inoculation of 

 sheep would be attended by the same danger when 

 the o})eration was performed on proper surgical i)rin- 

 ciples. Without loss of time, therefore, we had re- 

 course to the following 



Eocperiment 4. 



Sept. 21. — A healthy sheep was selected for ovina- 

 tion, and, at the suggestion of IMr. Ceely, several 

 scratches were made through the epidermis, on the 

 inner side of the fore leg : these shght incisions were 

 arranged in groups, distinct from each other, and on 

 them some dry but transparent lymph, which had been 

 taken five days before from one of Mr. Statham's sheep, 

 at Datchett, was rubbed, which, however, was first 

 moistened with a httle water. The limb was kept 

 extended afterwards, until the exuded blood had 

 become dry. 



Sept. 22. — The skin is inflamed and raised in a fold 

 extending a short distance fi'om the places of inocula- 

 tion towards the front of the leg, 



Sept. 23. — The swelhng and redness of the integu- 

 ment are diminished ; the cuticle coverino; the scratched 

 surfaces is raised bv fluid effused beneath it. 



Sept. 24. — There are, on the ovinated places, dis- 

 tinct pustules, coloured yellow by the secretion they 

 contain. 



Sept. 25. — The pustules have become of a darker 

 hue, which depends partly on a drying up of their 

 contents, and partly on the approaching desquamation 

 of the epidermis. * 



Sept. 27. — Many of the scabs have fallen off", and 

 the exposed sores have a healthy appearance. 



