Transcriber’s Notes: Text enclosed by underscores is in italics (_italics_), text enclosed by equal signs is in bold (=bold=), and _{} encloses subscripted material. The whole number part of a mixed fraction is separated from the fractional part with -, for example, 2-1/2. Additional Transcriber’s Notes are at the end. How to Become a Scientist. GIVING Interesting and Instructive Experiments IN CHEMISTRY, Mechanics, Acoustics AND PYROTECHNICS. ALSO CONTAINING MATHEMATICAL PROBLEMS and PUZZLES BOTH USEFUL AND AMUSING. NEW YORK: FRANK TOUSEY, Publisher, 24 UNION SQUARE. * * * * * Entered according to Act of Congress, in the year 1900, by FRANK TOUSEY, in the Office of the Librarian of Congress at Washington, D. C. How to Become a Scientist. Chemistry, optics, pneumatics, mechanics, and mathematics, all contribute their share towards furnishing recreation and sport for the social gathering, or the family fireside. The magical combinations and effects of chemistry have furnished an almost infinite variety of pleasant experiments, which may be performed by our youthful friends with great success if a little care be taken; and the other branches of natural science are nearly as replete with interest. The following _repertoire_ of such tricks and illusions will be found exceedingly complete, although pains have been taken to select only the best and most startling of them. A large number are entirely new, but are described with sufficient clearness to enable any person of ordinary intelligence to become expert in them, with a little practice. Chemical Amusements. Chemistry is one of the most attractive sciences. From the beginning to the end the student is surprised and delighted with the developments of the exact discrimination, as well as the power and capacity, which are displayed in various forms of chemical action. Dissolve two substances in the same fluid, and then, by evaporation or otherwise, cause them to reassume a solid form, and each particle will unite with its own kind, to the entire exclusion of all others. Thus, if sulphate of copper and carbonate of soda are dissolved in boiling water, and then the water is evaporated, each salt will be reformed as before. This phenomenon is the result of one of the first principles of the science, and as such is passed over without thought; but it is a wonderful phenomenon, and made of no account, only by the fact that it is so common and so familiar. It is by the action of this same principle, “chemical affinity,” that we produce the curious experiments with Sympathetic Inks.