From =eclampsia= it is not so easy to diagnose, but the line between eclampsia and epilepsy has not been accurately drawn, and some have even shown a disposition to drop eclampsia from medical nomenclature. Eclampsia may be defined as general convulsions dependent on some eccentric irritation, and which do not recur after such irritation has been removed. This would remove from the category of epileptic attacks the cases of convulsions in which the attacks were due to intestinal or nasal parasites, dentition irritation, tumors pressing on nerves, canine distemper and other infectious diseases. So far the distinction might be made by the diagnosis of the particular disease on which the convulsions depend. There remains however a class of cases in which the centric nervous disorder on which the epileptic seizure depends is present, and also the peripheral source of irritation (worms, etc.). In such a case the presence of the worms or other eccentric source of irritation, even if added to the fact that this was the immediate exciting cause of the epileptic explosion, could not do away with the fact that the essential conditions of epilepsy are permanently present in the nervous centres. The difficulty therefore of making an accurate differential diagnosis, resides largely in the impossibility of drawing a definite line of pathological separation between eclampsia and epilepsy. From =Vertigo= epilepsy is distinguished by the absence in the former of marked spasmodic contractions. It is only in the milder forms of epilepsy those in which the spasmodic action is so slight as to be overlooked, that this disease can be confounded with vertigo. From =Thrombosis= or =embolism= of the iliac or femoral arteries epilepsy is easily distinguished by the absence of exercise as the essential cause in the development of the latter. In thrombosis on the other hand, the loss of control over the hind limbs is developed at will by active motion (walking, trotting). In thrombosis too the absence of pulsation at the fetlocks or at any point below the seat of obstruction is conclusive.