TY - JOUR T1 - A Letter from Mr. Leeuwenhoeck, F. R. S. concerning the Muscular Fibres in Several Animals, and the Magnetick Quality Acquired by Iron, upon Standing for a Long Time in the Same Posture JF - Philosophical Transactions (1683-1775) VL - 32 SP - 72 EP - 75 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1722.0013 M3 - doi:10.1098/rstl.1722.0013 AU - van Leuwenhoek, A. ER -