TY - JOUR T1 - Observations on Sand Iron: In a Letter from Mr. Henry Horne, to Mr. John Ellicot, F. R. S. JF - Philosophical Transactions (1683-1775) VL - 53 SP - 48 EP - 61 PY - 1763/01/01/ UR - http://dx.doi.org/10.1098/rstl.1763.0014 M3 - doi:10.1098/rstl.1763.0014 AU - Horne, H. ER -