'Experiments and Matters recommended to Mr William Balle' Three items listed: "To write to Dr Cotton to examine whether the difference of the weight of bodies above and under ground, in the experiment made by himself, proceeded from the different degrees of thickness, or from the pressure of Air, according to the way suggested by Mr Boyle, May 25 1664"; "To observe the variation of the Needle in Whitehall garden where were desired to be present My Lord Brouncker, Sir Robert Moray, Sir Paul Neile, Mr Oldenburg, Mr Hook July 6 1664" and "To have his quadrepolar magnet armed on all the 4 poles, July 20 1664" 1664