Sometimes through an accident or on account of disease, the womb expels the foetus before it is fully developed. If this occurs before the end of the third month we call it an abortion; if it occurs between the third and seventh months we call it a miscarriage; while if it occurs after the seventh month but before the normal time of labor we call it a premature labor. Formerly it was considered that there was no possibility of the child living if it were born before the seventh month. Now, by the aid of incubators, even those born at five months have a chance to live. By that time the body is fully formed, so the chief requirements are a steady temperature and proper care and food. Great care must be exercised, as a slight cooling of the air may result in the death of the babe. Abortions are either accidental, criminal, or justifiable, that is, brought on to preserve the life of the mother. Accidental abortions may follow a sudden fall or a sudden shock, either mental or physical, to the mother. They may be due to some disease either of the mother or of the foetus. Of the diseases responsible for abortions the one with the largest percentage is syphilis. It is estimated that this disease is responsible for forty per cent. of accidental abortions and miscarriages. Whenever a physician has for a patient a woman who gives a history of having had several abortions without any apparent cause and all at about the same age of the foetus, he immediately becomes suspicious of syphilis either of the father or the mother. It is a peculiar fact with this disease that it may be transmitted to the offspring without the mother ever actually having the disease. This is an instance of "visiting the sins of the fathers upon the children unto the third and fourth generation." Many a weak frame owes its condition to a dissipated father, grandfather or even great-grandfather. It is possible, though, for a man or woman who has had this disease to have a healthy child if the disease has been properly treated. Under some circumstances, especially with a deformed pelvis, if pregnancy were allowed to proceed normally it probably would result in the death of the mother. Then, it is considered justifiable for the physician in charge of the case to produce an abortion in order to save the life of the mother. Those cases are rare and such a procedure never is undertaken except in extreme cases.