554 CONTRIBUTIONS TO VETERINARY MEDICINE. 
sition vii, 5d Book Dr. Lardner’s ‘ Elements of Euclid/) 
(e A circular piece of pasteboard, divided a little beyond the 
centre so as to leave a triangular space, which render con¬ 
tracted to make it concave by supporting it with your fingers; 
then consider, no expansion can happen hut hy growth of shelving , 
which could not happen hut hy equal descent of the sole opposite” 
Remove the support of your fingers at points of the diagram 
that represent the heels, and the crown of the arch will come 
down flat, producing eccentric motion, or that ruinous expan¬ 
sion which happens in heavy horses, described so ably by 
the late Professor Coleman, who was an opponent of this very 
eccentric action. Now, I leave it to the geometrical knowledge 
of Mr. Reeve, to the knowledge and perspicacity of Mr. 
Percivall, to put this matter fairly before the profession. 
Elongate, the state of being stretched; this must be under¬ 
stood in this sense, and not to lengthen, as the direction in 
which it happens was proved by Mr. Gloag’s experiment. 
No. 9- 
CONTRIBUTIONS TO VETERINARY MEDICINE. 
By William Gavin, M.R.C.V.S., Malton, York. 
Phthisis Pulmonalis. 
This case first came under my notice on the 2d of February 
of this year, and occurred in a black cow five years old. She 
had not previously been ill that the owner was aware of. I 
found her labouring under typhus, with cough and unsound 
lungs ; but these last had existed for a long time: she re¬ 
covered her usual health in a little time, and I did not see 
her again until the 13th of May, when she had another 
attack. At this time she gave no milk, being in calf, and had 
a very precarious appetite. Her hind legs and hoofs were 
mostly perfectly cold; once or twice they were filled and 
hot. In a fortnight’s time her general health improved; but 
now, the hoofs of the hind feet began to loosen and come off 
one by one, the right ones first, that leg for some time being 
nearly always very cold, but the left foot becoming the worst. 
The right began to recover. 
On June the 22d there was tumefaction of the right 
coronet, ulceration proceeding slowly in the effort to separate 
the last phalanges, which were dead. They have already 
come off the other leg, the line of separation in which is half 
