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It includes useful chapters that the novice researcher should be familiar with, such as initial instructions related to the work system, the necessary tools and equipment for the bacteriological laboratory, the purposes for which they are used, an explanation and installation of the microscope, how to use it and care for it... etc.The book is divided into sections, some of which deal with the study of bacteria from a general perspective in terms of dyeing them, cultivating them, and identifying their various types. Some include tests for water, soil, and milk, and some include the study of other microorganisms and the changes they cause. The book is appended with a comprehensive explanation of commonly used bacteriological environments and dyes, including their composition and how to prepare them.