After an hemorrhagic infraction is formed, the subsequent changes are of a degenerative character. The blood loses its coloring matter and breaks down into a mass of granules, forming a dry, yellow, wedge-shaped mass, or it may break down and form into a puriform fluid, or it may be surrounded by a zone of inflammation or of gangrene.
The above condition of the system will explain why and under the circumstances enumerated, the injection of a blood vessel may be brought to a sudden stop without any apparent cause, and the injecting fluid flow back towards the injecting point.
The various causes for such a result have been clearly demonstrated, but with the knowledge of these causes as previous stated, the remedy can be applied without much trouble. It can be estimated by the amount of fluid injected, about to what extent the vessel has been filled, and by following its course the point where the obstruction is, can be easily ascertained.
By reopening the vessel at a point above, the injection may still be carried on successfully, or the corresponding vessel on the other side of the body may be used for that purpose.
It is then that even a limited amount of knowledge of anatomy of the human body will be found of immense advantage to the operator, inasmuch as it will trace the cause of action, to be followed in this case, and will enable him to do so with success.
If, on the other hand, too great a pressure is brought to bear, so as to remove the obstruction by the mere weight of the fluid injected, the walls of the vessel may not be able to resist the strain, and the injecting fluid loses itself in the surrounding tissue and cavities, thereby failing to accomplish its mission.
PROCESS OF EMBALMING.
The following process is more laborious and requires more time than the one already given, but at the same time it is more complete and lasting, and when the operation is skillfully and properly performed, the body may be said to be embalmed for an indefinite period of time.
But to carry out this process to a successful issue, it will be found strictly necessary to study well, and bear in mind, all the details of the operation.