This book was originally prepared for use as an instruction manual by teachers, where a certain level of experience, precaution, and discretion are presumed.

A number of experiments in this book, although totally safe if properly prepared and wisely handled, could prove dangerous to the inexperienced or careless experimenter. Any experiment involving fire or explosive reactions should be approached with the greatest of caution and protection.
Be careful where you find or purchase materials so that you don’t end up using defective, and
therefore dangerous, materials.

Good scientists are methodical and excruciatingly careful. Please be one. In the interest of safety several experiments published in the original edition of this book have been deleted.

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