150 
URETHRAL CALCULUS IN A PIG. 
so as they are applied for the promotion of Veterinary 
Science — 
That a first prize of a silver medal, a second of a bronze 
medal, and a third of a certificate of merit, to be competed for 
by the pupils of the second session, be given for the best 
essay on, “ the Eye of the Horse, embracing its anatomy and 
physiology, the laws of light applicable to vision, the chemical 
composition of the humours, and the pathology, treatment, 
and results of the disease known by the name of Constitu¬ 
tional Ophthalmia.” 
PREVALENCE OE PLEURO-PNEUMONIA. 
This fatal disease has again become very prevalent in the 
London dairies, more particularly on the south side of the 
river. The attacks are marked with much virulence in a 
very great number of instances; and some of the public 
prints, which have drawn attention to the matter, state that 
the fatality is as much as 9-5 per cent. 
URETHRAL CALCULUS IN A PIG. 
Mr. Arnold, M.R.C.V.S., Woodbridge, Suffolk, has 
forwarded to us a very fine calculus taken from the urethral 
canal of a pig. The history of the case being chiefly ob¬ 
tained from the person who had the care of the animal, and 
who alone examined him after death, is necessarily brief 
and imperfect. 
It appears that the subject of it was an aged boar. 
He had been fed on a mixed diet of refuse roots and dross 
corn, and had liberty to roam on the pastures adjoining the 
yard. From the description the yard-man gave of the dis¬ 
covery of the calculus, Mr. Arnold is quite satisfied that it 
was located in the urethra, about eight inches from the ex¬ 
ternal opening. 
The animal was considered to be worn out, and in conse¬ 
quence thereof another boar was kept, both of which were 
allowed to run at liberty with the whole of the sows ; from 
which cause it could not be ascertained when he last had 
sexual intercourse. He was found dead, but had not been 
observed to be unwell previously. He v r as flayed, and the 
