Why do living things and physical phenomena take the forms they do? Analyzing the mathematical and physical aspects of biological processes, this historic work, first published in 1917, has become renowned as well for the poetry of is descriptions.

    Each listing is easy to read and includes identification, infectious agent, occurrence, mode of transmission, incubation period, susceptibility and resistance. The 18th edition of this text is available, for the first time, online. Translations into several languages-currently Spanish, Portuguese, Korean, Serbian, Indonesian and Italian make this text a global treasure.