TY - JOUR T1 - Two Letters from Mr. Stephen Gray, F. R. S. to C. Mortimer, M. D. Secr. R. S. Containing Farther Accounts of His Experiments concerning Electricity JF - Philosophical Transactions (1683-1775) VL - 37 SP - 397 EP - 407 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1731.0067 M3 - doi:10.1098/rstl.1731.0067 AU - Gray, S. ER -