This book is designed as a text-book for amateurs, students, and others who wish to take up a systematic course of elementary electrical experiments at home or in school. Full directions are given for....... _Two Hundred Simple Experiments._ The experiments are discussed by the author, after the student has been led to form his own opinion about the results obtained and the points learned. In selecting the apparatus for the experiments in this book, the author has kept constantly in mind the fact that the average student will not buy the expensive pieces usually described in text-books. The two hundred experiments given can be performed with simple apparatus; in fact, the student should make at least a part of his own apparatus, and for the benefit of those who wish to do this, the author has given, throughout the work, explanations that will aid in the construction of certain pieces especially adapted to these experiments. For those who have the author's "How Two Boys Made Their Own Electrical Apparatus," constant references have been made to it as the "Apparatus Book," as this contains full details for making almost all kinds of simple apparatus needed in "The Study of Elementary Electricity and Magnetism by Experiment." _If you wish to take up a systematic course of experiments--experiments that may be performed with simple, inexpensive apparatus,--this book will serve as a valuable guide._ Condensed List of Apparatus FOR "The Study of Elementary Electricity and Magnetism by Experiment." _Number_ 1. Steel Needles; package of twenty-five.--2. Flat Cork.--3. Candle.--4-15. Annealed Iron Wires; assorted lengths.--16. Horseshoe Magnet; best quality; English.--17. Iron Filings.--18. Parts for Compass.--19, 20. Wire Nails; soft steel.--21, 22. Spring Steel; for bar magnets.--23. Iron Ring.--24. Sifter; for iron filings.--25. Spring Steel; for flexible magnet.--26, 27. Ebonite Sheets; with special surface.--28. Ebonite Rod.--29. Ebonite Rod; short.--30. Flannel Cloth.--31. Tissue Paper.--32. Cotton Thread.--33. Silk Thread.--34. Support Base.--35. Support Rod.--36. Support Wire.--37. Wire Swing.--38. Sheet of Glass.--39. Hairpin.--40. Circular Conductor.--41. Circular Conductor.--42. Electrophorus Cover.--43. Insulating Table.--44. Insulated Copper Wire.--45. Rubber Band.--46. Bent Wire Clamps.--47. Cylindrical Conductor.--48. Discharger; for condenser.--49. Aluminum-Leaf.--50. Wires.