Letters, 'Of the electric property of the torpedo' from John Walsh to Benjamin Franklin Three letters comprising a paper by Walsh on the torpedo's electric properties, in which Walsh asserts that the torpedo or electric ray forms its circuit through the same conductors with electricity and by being intercepted by the same non-conductors. Subject: Zoology / Marine Biology These letters were published in Philosophical Transactions as a paper titled 'Of the electric property of the torpedo'. July 1772 - July 1773