EXPLANATION OF THE PLATES. 



PLATE L — Represents a portion of the skin, from which the wool 

 has been detached, in the papular stage of the disease ; some 

 of the nodules being confluent, and others distinct. 



PLATE IL — Gives a view of the inner part of the hind leg, with 

 the affection in its vesicular stage. A few of the papulae are yet 

 uncovered by vesicles. 



PLATE IIL — Shews the crustaceous stage, as it appears when the 

 fall of the scabs has been interfered with by local injuries. 



PLATE IV. — Fig. 1. A section of the head of a sheep, exhibiting 

 mucous vari on the Schneiderian membrane. 



Fig. 2. The larynx and trachea laid open, to shew the deve- 

 lopement of vari on their lining membrane, 



PLATE V. — The progress of ovination as it is observed from the 

 third to the twenty-fourth days. The figures respectively 

 named, the third, fourth, and f/th days, represent the com- 

 mencement and spread of the variolous inflammation : the eighth 

 day exhibits the central depression of the ovinated spot, and a 

 stigma near to it, also the efflorescent rash which precedes the 

 papulae. The tenth day shews small vesicles arranged in a cres- 

 centic form on the site of the inoculation : the thirteenth day, a 

 large vesicle covering the same place : the eighteenth day, the 

 elevated cuticle still adhering as a dark coloured scab : and the 

 twenty -fourth day, ulceration of the dermis going on beneath the 

 epidermis. 



DIRECTIONS TO THE BINDER. 



PLATE III to be placed as a frontispiece, and the remainder of 

 the plates at the end of the volume. 



