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If you enjoyed these first chapters on the history and significance of microbiology and on the chemical structure of organisms, consider buying the book. We designed Through the Microscope as an online resource, unlike most textbooks on the market that create online resources as an afterthought to sell you their overpriced hard copy. Thus, the pricing model is different. You are paying for a subscription to gain access to the material. It's only $30 and has stayed that way for over 25 years.