On the Origin of Species Darwin's ideas with those of Lamarck and Goethe while still reflecting the spirit of "Naturphilosophie". Their ambitious programme to reconstruct the evolutionary history of life was joined by Huxley and supported by discoveries in palaeontology. Haeckel used embryology extensively in his recapitulation theory, which embodied a progressive, almost linear model of evolution. Darwin was cautious about such histories, and had already noted that von Baer's laws of embryology supported his idea of complex branching. Asa Gray promoted and defended "Origin" against those American naturalists with an idealist approach, notably Louis Agassiz who viewed every species as a distinct fixed unit
Reactions to On the Origin of Species agent for the propagation of the Gospel – i.e. the devil's gospel." The position of Richard Owen was unknown: when emphasising to a Parliamentary committee the need for a new Natural History museum, he pointed out that "The whole intellectual world this year has been excited by a book on the origin of species; and what is the consequence? Visitors come to the British Museum, and they say, 'Let us see all these varieties of pigeons: where is the tumbler, where is the pouter?' and I am obliged with shame to say, I can show you none of them..." As