Quote by Alan H. Linton
Throughout 150 years of the science of bacteriology, there is no evidence that one species of bacteria has changed into another... Since there is no evidence for species changes between the simplest forms of unicellular life, it is not surprising that there is no evidence for evolution from prokaryotic [i.e., bacterial] to eukaryotic [i.e., plant and animal] cells, let alone throughout the whole array of higher multicellular organisms.
Summary
This quote suggests that over the course of 150 years of studying bacteria, there is no evidence to support the idea that one species of bacteria can evolve into another. Furthermore, the quote states that since there is no evidence for evolution from simpler unicellular life forms to more complex eukaryotic cells (found in plants and animals), it is not surprising that there is also no evidence for evolution across a wide range of multicellular organisms. Essentially, the quote questions the validity of the theory of evolution, particularly in relation to the evolution of different types of cells and organisms.