Also known as Galen he also studied the hearts, arteries and veins, by dissecting monkeys as dissecting humans at the time was no permitted.
The actual year is not known, but probably about 140 - 216 AD, during the career of Aelius Galenus, aka Claudius Galenus or Galen of Pergamon, a Greek doctor working in Rome. His interest in the circulatory system, his near obsession with accurate diagnosis, and his emphasis on detailed observations of his patients symptoms may well have led him to use pulse rate as a diagnostic tool.
Aelius Herodianus died in 250.
Aelius Aristides died in 181.
Aelius Aristides was born in 117.
the contribution of inventing microscopes is go to die
Claudius Galenus
modern microscope
pasteurization-microbiology
opthalmologist
clenton cardona
biomass production expert
He presented a theory of evolution.