Miscellaneous letters on several subjects in philosophy and astronomy. [electronic resource] : Wrote to the learned Dr. Nicholson, late Archbishop of Cashell. Viz. I. An account of the great variety of plants, shell-stones, and many other Curiosities, in the parish of Magilligan, in the County of Londonderry in Ireland; together with a curious Account of the forming the Land, being formerly under Sea. II. On the Declension of the Level of the Sea. III. On the Aurora Borealis, or Northern Light. IV. On the Irish Bogs, Timber found under these Bogs, and several curious Remarks on the first Planting the World and Ireland, drawn from the Natural History of such Bogs and Timber. V. On the General Tides in the Atlantic Ocean, by a New Hypothesis, and that the Moon hath no Influence on the Tides. VI. On the Cause of Gravity, and the Continuation of Motion, by a New and Curious Hypothesis. Vii. On the Load-Stone, that the Old Hypotheses were Insufficient, and a new one drawn from the Northern Light. Viii. An endeavour to clear astronomy of the incredible, by a new System of the World, wherein the Projectile Power, and Gravitating Principles of Sir Isaac Newton, are proved to be not according to Nature, and Impossible; and that the Theory of the Moon is particularly very ill accounted for by Sir Isaac's Principles; and New Principles, drawn from the Nature of Fluids, and a repelling Power in the Sun, and that the long Telescopes help to deceive us. By Robert Innes, A.M.