Static charges of electricity occur in two forms, viz.: positive charges and negative charges. We now know that a negative charge consists of an aggregate of small particles called electrons and that a positive charge consists of an aggregate of small particles called protons. These electrons and protons may with equal correctness be considered particles of matter or particles of energy.
©1930 by Iowa State Teachers College
"About Static Electricity,"
Science Bulletin: Vol. 3:
3, Article 9.
Available at: https://scholarworks.uni.edu/science_bulletin/vol3/iss3/9