The band followed this up with an extensive touring schedule, playing with both guest musicians as a full line-up and as an acoustic duo-the latter tour documented on the " Vera Causa " album in 2001.
2.
The structure of Darwin's argument showed the influence of John Herschel, whose philosophy of science maintained that a mechanism could be called a " vera causa " ( true cause ) if three things could be demonstrated : its existence in nature, its ability to produce the effects of interest, and its ability to explain a wide range of observations.
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