38 BIOLOGY AND ITS MAKERS 
an appeal to authority, but by the method which he founded. 
His great claim to renown is, not that his work outshone all 
other work (that of Galen in particular) in accuracy and 
brilliancy, but that he overthrew dependence on authority 
and re-established the scientific method of ascertaining truth. 
It was the method of Aristotle and Galen given anew to the 
world. 
The spirit of progress was now released from bondage, 
but we have still a long way to go under its guidance to reach 
the gateway of modern biology. 
