Putrefaction, while appearing on an average, under a mean temperature, in from three to six days, is yet influenced by many circumstances. The heat and moisture of the surroundings, the age, sex, amount of flesh on the body, mode of death, position and coverings of body, all must be considered.
The temperature of the body aids us, yet the retention of warmth by the abdominal viscera may be met with in a marked degree twenty hours after death; in one case, personally known to me, the thermometer registered 76° F. seventeen hours after death.
The temperature of the body, its rigidity, and the evidences of putrefaction all furnish data from which we can estimate the probable time which has elapsed since death. It must be remembered that no one of them furnishes any positive proof.
Some medical jurists have attempted to give a more definite character to these changes in the recently dead body by dividing the interval between the stopping of the heart’s action and the beginning of putrefaction into three periods. In the first, the warmth, pliability, and muscular irritability remain. In the second, these conditions are lost and the body is cold and rigid. In the third, the body is cold and pliant, the muscles are relaxed, and the joints are flexible, the cadaveric rigidity having entirely ceased.
There can be no doubt about the existence of these stages, but when we come to define the precise time at which one begins and the other ends, we find it impossible. For example, the first stage embraces a period which cannot be more closely defined than by stating that the person may have been dead from a few minutes to twenty hours—a statement too vague to be upheld by a counsel who defends a prisoner.
The changes which take place in these periods and the average time they last have been given as follows by Devergie:
First Period, Few Minutes to Twenty Hours.—Characterized by warmth of the body and general or partial relaxation of the voluntary muscles. To what portion of this period the special case belongs must be estimated according to the degree of heat in the trunk and extremities and the degree of rigidity in the muscles, the neck and the jaws commonly showing this condition first, the legs last. Warmth of the body rarely remains as long as twenty hours; in general it is sensibly cold in from ten to twelve hours. During this period the muscles are susceptible of contraction under the galvanic current, and in the early stage under the stimulus of blows.
Second Period, Ten Hours to Three Days.—The body is perfectly cold throughout and rigidity is well marked. The muscles no longer respond to stimuli. The duration of this period seems long, yet in one instance the body will be found cold and rigid nine hours after death. Again, cooling and rigidity may not come on for three or four days.
Third Period, Three to Eight Days.—The body is perfectly cold. The limbs and trunk pliant and free from cadaveric rigidity. The muscles are not capable of contracting. In summer this period is much shorter; often it will come on before three days.