Familiar Letters on Chemistry is a book written by Justus Liebig, a German chemist, in the form of letters addressed to a female friend. The book is an introduction to the field of chemistry and covers a wide range of topics, including the composition of air, water, and food; the nature of acids and bases; and the chemical properties of metals and non-metals. The letters are written in a conversational style and are aimed at a general audience, making the book accessible to non-scientists. Liebig's explanations are clear and concise, and he uses everyday examples to illustrate complex concepts. The book was first published in 1843 and has since become a classic in the field of chemistry.Until very recently it was supposed that the physical qualities of bodies, i.e. hardness, colour, density, transparency, and still more their chemical properties, must depend upon the nature of their elements, or upon their composition. It was tacitly received as a principle, that two bodies containing the same elements in the same proportion, must of necessity possess the same properties. We could not imagine an exact identity of composition giving rise to two bodies entirely different in their sensible appearance and chemical relations.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.