In these 38 years of the beginning of biology there was a tremendous development of new ideas, new concepts, new knowledge, and then things slowed down and for the next hundred years there was a steady progress but it was rather slow. And one reason of this… one reason for this was that there were so many opposing ideas, so many opposing concepts that had to be overcome – and I will come back to that later – before biology could really harvest what it had seeded… sowed in the years between 1828 and 1866. And there was one thing in particular that, as far as I'm concerned, was slowing down progress, and that was so-called ‘physics envy’ by so many biologists. They thought they were… sold by the physicists the idea that physics was the only really good science and they wanted to make… so they wanted to make biology just like physics and put it all in terms of laws and mathematics, and of course it didn't work. But they didn't realise that and it took a long time until this feeling that biology got to be just like physics was overcome.