2. There was in many cases a separation of the blood into crassamentum and yellow serum.
3. There were a few cases in which this separation took place, and the serum was of a natural colour.
4. There were many cases in which the blood was as sizy as in pneumony and rheumatism.
5. The blood was in some instances covered above with blue pellicle of sizy lymph, while the part which lay in the bottom of the bowl was dissolved. The lymph was in two cases mixed with green streaks.
6. It was in a few instances of a dark colour, and as fluid as molasses. I saw this kind of blood in a man who walked about his house during the whole of his sickness, and who finally recovered. Both this, and the fifth kind of blood which has been mentioned, occurred chiefly where bleeding had been omitted altogether, or used too sparingly in the beginning of the disease.
7. In some patients the blood, in the course of the disease, exhibited nearly all the appearances which have been mentioned. They were varied by the time in which the blood was drawn, and by the nature and force of the remedies which had been used in the disease.
The effects of blood-letting upon the system were as follow:
1. It raised the pulse when depressed, and quickened it, when it was preternaturally slow, or subject to intermissions.
2. It reduced its force and frequency.
3. It checked in many cases the vomiting which occurred in the beginning of the disease, and thereby enabled the stomach to retain the purging medicine. It likewise assisted the purge in preventing the dangerous or fatal vomiting which came on about the fifth day.