The Veterinarian of the Prairie Farmer says: TJndoubtedly, the liorse is subject to tooth-ache as well as his DWJier. The structure of the hores's teeth is similar to that oí man; thoy ïie also, but not so frequently, subject to the í-.aine diseases, such as caries and íxostoses of the fangs, and it is thereïorej not by any means unreasonable to presume that these diseases will have the same effects in produciug pain in the horse as in man. It is, however, a very difflcult matter to prove this, as the horse, unfortunately, cannot give verbal expression to bis ailments. The symptoms which characterize it aie al30 not ao diatinctive, but that they may be taken as the concomitants of other ailments. We will suppose an animal to be the subject of tooth-ache. In the ftrst place, he would very likely be off his feed, and if, when freo from pain and feeding, he should all at once bite upon some hard substance wilh the diseased tooth, he would suddenly leave olï masticating, perhaps rest the sideof the head affected on the rnangt r, rub it gently against the edge, or toss his head uu and down; the eye on the affected side might shed a few tears, and the glands under the jaw on that side rna be more or less swollen. But these things, however, as before stated. are not so decidedly distinctive as to authorize us in at once setting down the case as oneof tooth-ache. Other marks may, however come to our assistance. Suppose the fang oí the tooth to be affected with caries or deeay, aa the disease progresses, and the lower parts die the death oí' molecular decay, the crown of the tooth would naturally sink beluvv the level of that of the other teetu; thisof course can be ascertained by a careful exannnatioii of the mouth, and then our diagnosis of the affection, as being one oï tooth-ache, will stand on tolerably flrm grounds.