It is softened by alkalies, such as caustic potash or soda and ammonia, the parts first attacked being the commissures, then the frog, and afterwards the sole and wall.
"Diseases of the Horse's Foot"
Harry Caulton Reeks
At the same time the lines of the face become drawn, the commissures of the lips pulled upwards, the eyes staring and haggard, the eyelids puckered, the nostrils extended, and the whole expression indicative of the intense and agonizing pain of the disease.
"Diseases of the Horse's Foot"
Harry Caulton Reeks
The distance apart, T, T, of the two commissures of the lips gives, very nearly, the distance from the superior border of the orbital arch to the base of the ear or the auditory meatus.
"Artistic Anatomy of Animals"
Édouard Cuyer