This early works on "Monographs On Experimental Biology is a comprehensive and informative look at the subject with much of the information still useful and practical today. Introduction: Some of the fundamental ideas of Biology are most difficult to define with precision. This is especially true of such conceptions as life, vitality, injury, recovery and death. To put these conceptions on a more definite basis it is necessary to investigate them by quantitative methods. To illustrate this we may consider some researches on the electrical conductivity of organisms. These experiments show that the electrical resistance of a plant or animal is an excellent indicator of what may be called its normal condition of vitality....... Many of the earliest books, particularly those dating back to the 1900"s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.