TY - JOUR T1 - Extract of a Letter from John Winthrop, Esq; F. R. S. Hollisian Professor of Mathematics and Natural Philosophy, at Cambridge, N. England; To B. Franklin, LL. D. F. R. S. Dated Sept. 6. 1769 JF - Philosophical Transactions (1683-1775) VL - 60 SP - 358 EP - 362 PY - 1770/01/01/ UR - http://dx.doi.org/10.1098/rstl.1770.0032 M3 - doi:10.1098/rstl.1770.0032 AU - Winthrop, J. ER -