Physicians of this era were not transfusing blood; it had been experimented with by researchers. Results were so poor they started trying transfusing milk from cows, goats, and even humans. Again results were very poor. The main reason transfusions didn't work in these days was that blood types had yet to be discovered. The discovery of the first three human blood groups wasn't until 1901; but saving lives with transfusions was a regular thing until just before World War II.