Tom is applying for a job as a signalman for the local railroad, and is told to meet the inspector at the signal box. The inspector decides to give Tom a pop quiz, asking, "What would you do if you realized that two trains were heading towards ea... Read more of Signal man's test at Free Jokes.caInformational Site Network Informational
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Articles from Aids To Forensic Medicine And Toxicology

Delivery

Action Of Poisons; Classification Of Poisons

Definition Of A Poison

Copper And Its Preparations

Wounds And Mechanical Injuries

Detection Of Poisons

Carbolic Acid

Aconite

Hydrochloric Acid

Crimes


Signs Of Death





(1) Cadaveric appearance; ashy white colour. (2) Cessation of the
circulation and respiration, no sound being heard by the stethoscope.
Cessation of the circulation may be determined by (a) placing a ligature
round the base of a finger (Magnus' test); (b) injecting a solution of
fluorescin (Icard's test); (c) looking through the web of the fingers at
a bright light (diaphanous test); (d) the dulling of a steel needle when
thrust into the living body; (e) the clear outline of the dead heart
when viewed in the fluorescent screen. (3) The state of the eye; the
tension is at once lost; iris insensible to light, fundus yellow in
colour; cornea dull and sunken. (4) The state of the skin; pale, livid,
with loss of elasticity. (5) Extinction of muscular irritability. The
above signs afford no means of determining how long life has been
extinct. The following, however, do:

=Cooling of the Body.=--The average internal temperature of the body is
from 98░ to 100░ F. The time taken in cooling is from fifteen to twenty
hours, but it may be modified by the kind of death, the age of the
person, the presence or absence of clothing on the body, the surrounding
temperature, and the stillness or otherwise of the air about the body.
Still, the body, other things being equal, may be said to be quite
cold in about twelve hours.

=Hypostasis= or =post-mortem staining= is due to the settling down of
the blood in the most dependent parts of the body while the body is
cooling. It is a sure sign of death, and occurs in all forms of death,
even in that due to hŠmorrhage, although not so marked in degree.
Post-mortem staining (cadaveric lividity) begins to appear in from
eight to twelve hours after death, and its position on the body will
help to determine the length of time the body has lain in the position
in which it was found. The staining is of a dull red or slaty blue
colour. It must be distinguished from ecchymosis the result of a bruise,
by making an incision into the part; in the case of hypostasis a few
small bloody points of divided arteries will be seen, in the case of
ecchymosis the subcutaneous tissues are infiltrated with blood-clot.
Internally, hypostasis must not be mistaken for congestion of the brain
or lungs, or the results of inflammation of the intestines. If the
intestine is pulled straight, inflammatory redness is continuous,
hypostasis is disconnected. About the neck hypostasis must not be
mistaken for the mark of a cord or other ligature. When the blood is of
a bright red colour after death (as happens in poisoning by CO or HCN,
or in death from cold), the hypostasis is bright red also.

=Cadaveric Rigidity--Rigor Mortis.=--For some time after death the
muscles continue to contract under stimuli. When this irritability
ceases--and it seldom exceeds two hours--rigidity and hardening sets in,
and in all cases precedes putrefaction. It is caused by the
coagulation of the muscle plasma. It commences in the muscles of the
back of the neck and lower jaw, and then passes into the muscles of the
face, front of the neck, chest, upper extremities, and lastly to the
lower extremities.

It has been noticed in the new-born infant, as well as in the foetus. It
lasts from sixteen to twenty hours or more. In lingering diseases, after
violent exertion, and in warm climates, it sets in quickly, and
disappears in two or three hours; in those who are in perfect health and
die from accident or asphyxia, it may not come on until from ten to
twenty-four hours, and may last three or four days. After death from
convulsions or strychnine-poisoning, the body may pass at once into
rigor mortis. Rigor mortis must be distinguished from cadaveric spasm
or the death clutch; in the former, articles in the hands are readily
removable, in the latter this is not the case. In tetanic spasm the
limbs when bent return to their former position; not so in rigor mortis.

=Putrefaction= appears in from one to three days after death, as a
greenish-blue discoloration of the abdomen; in the drowned, over the
head and face. This increases, becomes darker and more general, a strong
putrefactive odour is developed, the thorax and abdomen become distended
with gas, and the epidermis peels off. The muscles then become pulpy,
and assume a dark greenish colour, the whole body at length becoming
changed into a soft, semi-fluid mass. The organ first showing the
putrefactive change is the trachea; that which resists putrefaction
longest is the uterus. These putrefactive changes are modified by the
fat or lean condition of the body, the temperature (putrefaction taking
place more rapidly in summer than in winter), access of air, the period,
place, mode of interment, age, etc. Bodies which remain in water putrefy
more slowly than those in air.

=Saponification.=--In bodies which are very fat and have lain in water
or moist soil for from one to three years this process takes place, the
fat uniting with the ammonia given off by the decomposition to form
adipocere. This consists of a margarate or stearate of ammonium with
lime, oxide of iron, potash, certain fatty acids, and a yellowish
odorous matter. It has a fatty, unctuous feel, is either pure white or
pale yellow, with an odour of decayed cheese. Small portions of the body
may show signs of this change in six weeks.

=Post-Mortem Examination.=--Never make an autopsy in criminal cases
without a written order from the coroner or Procurator Fiscal. If
authorized, however, first have the body identified, then photographed
if it has not been identified. A medical man representing the accused
may be present, but only by consent of the Crown authorities or of the
Sheriff. Clothing should be examined for blood-stains, cuts, etc.

Examine external surface of body and take accurate measurements of
wounds, marks, deformities, tattooings; note degree and distribution of
post-mortem staining, rigidity, etc.

Examine brain by making incision from ear to ear across vertex, reflect
scalp forwards and backwards, and saw off calvarium. Examine brain
carefully externally and on section.

Examine organs of chest and abdomen through an incision made from
symphysis menti to pubis, reflecting tissues from chest wall and cutting
through costal cartilages.

In cases of suspected poisoning have several clean jars into which you
place the stomach with contents, intestines with contents, piece of
liver, kidney, spleen, etc., and seal each up carefully, attaching label
with name of deceased, date, and contained organs, and transmit these
personally to the analyst.

=Exhumation.=--A body which has been buried cannot be exhumed without an
order from a coroner, fiscal, or from the Home Secretary. There is no
legal limit in England as to when a body may be exhumed; in Scotland,
however, if an interval of twenty years has elapsed, an accused person
cannot be prosecuted (prescription of crime).





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