TY - JOUR T1 - An Extract of a Letter from the Reverend Dr. John Wallis to Richard Waller, Esq; Secretary to the Royal Society, Concerning the Spaces in the Cycloid, which are Perfectly Quadrable JF - Philosophical Transactions (1683-1775) VL - 19 SP - 111 EP - 113 PY - 1753/01/01/ UR - http://dx.doi.org/10.1098/rstl.1695.0017 M3 - doi:10.1098/rstl.1695.0017 AU - Wallis, J. ER -