The stoppage of the heart beat causes the nutritive fluids of the body to cease circulating. The cells are then no longer supplied with nutritive material, and the poisons which they are constantly throwing off accumulate, cell activity ceases, and the phenomenon we call death ensues. Suffocation acts in a very similar manner--oxygen ceases to be supplied to the blood; carbon dioxid accumulates; the vital fluids cease to flow, and death is the result. Dis-ease has been defined to be an absence of harmonious activity in the body. It may result from the inactivity of some particular function. A stomach which secretes no hydrochloric acid is abnormal or dis-eased. Again, a dis-ease may be due to an overdevelopment of some function, because the man whose stomach secretes more hydrochloric acid than digestion requires is as truly dis-eased as is the man whose stomach secretes too little. [Sidenote: Dis-ease is partial death] [Sidenote: Animals starve when fed on salt-free food] Dis-ease may also be defined as partial death, for it is the disturbance or weakening of functions whose complete failure we call death. Starvation illustrates one side of this process. When nutritive material ceases to be supplied, the cells have nothing with which to work, causing disturbance of function (dis-ease), and then partial, or complete death. The man in a desert under a hot sun will starve for water in one-tenth the time that he would starve for solid food. Animals fed on a diet from which all salts have been chemically removed will die in a shorter time than will those from which all food is withheld. This rather interesting fact is due to the rapid utilization of the salts residual in the body during the digestion and the assimilation of the salt-free foods taken. The order in which the withdrawal of nutritive substances will produce starvation is about as follows: 1 Aerial oxygen 2 Water 3 Mineral salts 4 Organic nitrogen 5 Carbohydrates [Sidenote: Examples of drug poisoning] Poisoning by drugs is an excellent illustration of dis-ease and death produced by specific starvation. When a man takes ether, this substance, passing to the brain, immediately interferes with the function of that organ. Insensibility to pain results. If ether is taken in larger quantities, the functions of the brain may be still further interfered with, and the nervous control of the heart beat will be lost, and death will ensue. When castor-oil is taken into the alimentary canal, the irritating substances therein contained inflame the cells of the mucous membrane, and excite them to abnormal secretion, thus disturbing the harmony of the body-activities, and producing dis-ease. [Sidenote: Scientific definition of dis-ease]