If the Montmor group had been running at the time, Denis would almost certainly have heard of events occurring in England in 1665 and 1666. The few meetings that he did attend included talks on work currently occurring in England. With this group less active, his access to current scientific gossip was reduced, and with an inability to read English for himself, Denis had no idea that blood infusion and attempts at transfusion were raising great interest on the other side of the Channel. Besides, there is little reason to believe he would have been particularly interested in the developments anyway; after all, Denis' chief area of research was mathematics.
In England, investigations relating to blood were continuing apace. In fact, they had been given a jolt when Oldenburg reported to the Royal Society that Johann Daniel Major, a German physician, had published a book advocating injecting chemicals directly into blood vessels. The German clearly knew a considerable amount about the subject, and there was an apparent danger that he would come to be known as the world leader in the area. National pride dictated that action needed to be taken immediately. On hearing the news, several members decided to have a go themselves. The journal book of the Royal Society records the chain of events that followed:
It was suggested by Dr Wilkins that the experiment of injecting
the blood of one dog into the vein of another might be made.
May 24, 1665
Dr Wilkins, Mr Daniel Coxe, Mr Thomas Coxe and Mr Hooke were
appointed to take care of injecting the blood of one dog into the
vein of another; and Mr Thomas Coxe was particularly desired to
try the changing of dogs' skins.