_Symptoms._ The leading objective symptom is the tonic condition of the muscles by which a perfect balance is established and maintained between the flexors and extensors so that the affected part maintains the same position which it had when the attack began, or any other position which may be given to it during the progress of the paroxysm. The position is only changed when the muscles involved have become completely exhausted. During the attack the affected muscles are swollen and firm, so that their outline may often be traced through the skin, later as the attack subsides they become soft and flaccid. Voluntary movement of the affected muscles is impossible until after the paroxysm. The attack usually comes on suddenly and in this respect resembles epilepsy; at other times there are premonitory symptoms of nervous anxiety, excitement or irritability. There is usually considerable impairment of consciousness, intelligence, common sensation, and even of the special senses. In a cataleptic dog Fröhner noted mental and motor troubles, considerable anæsthesia, and loss of sight, smell, and hearing. The eyes are fixed, the pupils either contracted or dilated, and the urine passed may be albuminous or even icteric. _Course, Duration._ Like other functional nervous disorders this is extremely uncertain in its progress. There may be but one attack or a succession; they may last from a few minutes, to 7 days (Fröhner), or even several weeks (Hertwig); they may end in recovery or less frequently they may prove fatal usually by inanition. _Treatment._ During a seizure a sudden shock will sometimes cut short the attack, douching with cold water, an inhalation of ammonia, of capsicum or of snuff, or the application of electricity in an interrupted current through the spine and affected muscles. Ether anæsthesia will not always relax (Sinkler). Inhalation of a few drops of nitrite of amyle has proved effective in man, as has also the injection subcutem of three drops of a 1 per cent solution of nitro-glycerine, apomorphine hypodermically is usually effective (Sinkler). Bromide of potassium has also been advised, and in case of coldness of the surface, a warm bath. When there is overloaded stomach and gastric indigestion an emetic is indicated, and in constipation a purgative (for speedy action chloride of barium or physostigma subcutem). In the intervals between attacks tonics and general hygiene should be invoked to build up the weakened nervous system. Quinine, and salts of iron, zinc or silver with a nourishing diet and out door exercise are especially indicated. INSOLATION. HEAT EXHAUSTION. SUNSTROKE. THERMIC FEVER.