Discuss how, in this remarkably concise section, Darwin demonstrates one of his most fundamental techniques: examining well-known phenomena and easily-understood phenomena among domesticated animals and plants, and then extending his observations by inference to the natural world. Discuss how this document displays how Darwin understood the importance of ecological interactions in shaping the evolution of species and their interactions. What connections does Darwin make between the number of cats in an area and the populations of heartsease and red clover. How might the population density of cats affect other common organisms?
