490 
CALCULI IN THE LACTIFEROUS DUCTS. 
pathic disease, end in disorganization of the feet, and consequent 
irremediable lameness. For the same reason that the metastatic 
disease is rather sub-acute than acute, we cannot — even supposing 
the case called for it — attack it with the same freedom and bold- 
ness we could the idiopathic form ; in general, the powers of the 
constitution, at the time the former sets in, being in too reduced a 
condition to admit of this. 
Laminitis may prove Epidemic or Sporadic in its cha- 
racter. There are seasons — hot summers, perhaps, more particu- 
larly — in which the disease has been known to prevail, if not 
in all parts and places, in some, and to an alarming extent. I can- 
not say I have seen this occur in my own practice, but I know 
those who have experienced the sad visitation ; and grievous the 
consequences of it have proved. 
CALCULI IN THE LACTIFEROUS DUCTS OF THE 
MAMMA OF A COW. 
By William Smith, M.R.C.V.S . , Norwich. 
On the evening of the 17th of May 1850, 1 visited, at the 
request of the owner, a fine Norfolk cow, at Arming Hall, near 
this city. Mv patient is eight years old, in excellent condition, 
and full profit; she was bred on the farm, and is a remarkably 
good specimen of this breed. 
I was sent for in consequence of the milker being unable to 
obtain any milk from the hind quarter of the left side of the udder, 
either on the previous evening or morning of this day, although it 
was obviously much distended with the secretion. 
Symptoms . — I found the animal restless, and shifting her posi- 
tion frequently — the left hind quarter of the mamma tense and full 
— the papilla swollen, very sensitive, and the bowels constipated : 
there was much apparent uneasiness. 
The external aperture of the duct was normal, nor did there 
appear to be any cause for the detention of the milk within this por- 
tion of the gland. I made several fruitless attempts to draw off the 
fluid. Not a drop followed. But, upon a close manipular examina- 
tion of the teat, I discovered a hard unyielding body situate at its 
base, which was easily pressed down the duct towards the nipple, 
to within three-quarters of an inch of its orifice. On the apex of 
the teat it resisted all attempts to get it below this point, although 
as much pressure was applied to force it downwards, and thus extract 
it, as was deemed advisable. 
