Page 246, changed two cases of "pyschology" to "psychology" (...widely known as students of psychology, of whom...); (...great a passion for psychology, and...) Page 266, changed "Allegmeine" to "Allgemeine" (...German biographer in the Allgemeine Deutsche...) Page 296, changed "know" to "known" (...who had known him intimately:...) Page 319, changed "galvonometer" to "galvanometer" (...machine deflected the needle of his galvanometer in the...) Page 340, changed "Abderdeen" to "Aberdeen" (...physical sciences, at Marischal College, Aberdeen.) Page 367, changed "realtive" to "relative" (...thoughts that occurred relative to problems...) Page 368, changed "suface" to "surface" (...as we go below the earth's surface, he...) Page 400, changed numerical order of index entry "Henry; Joseph" Page 400, changed "Keppler" to "Kepler" Page 401, added missing page reference "65" to "Mahomet; sarcophagus" Page 402, changed "Poggendorf" to "Poggendorff" Page 404, changed alphabetical order of "Winkelmann" Advertising material originally located at beginning of text moved to end. End of the Project Gutenberg EBook of Makers of Electricity, by Brother Potamian and James Joseph Walsh