Paper, 'Attempt to solve the phenomenon of the rise of vapours, formation of clouds and descent of rain in a letter to William Rutty from J [John Theophilus] Desaguliers' by Desaguliers Desaguliers writes on some meteorological theories, including the idea that 'rain is produced by the separation of the particles of fire from those of water, which last being then restored to their former specifick gravity, can no longer be sustained by the air, but must fall in drops'. He then focuses on the formation of clouds. Subject: Meteorology Read to the Royal Society on 5 and 12 December 1728 Published in Philosophical Transactions as 'An attempt to solve the phaenomenon of the rise of vapours, formation of clouds and descent of rain. In a letter from Dr. J. T. Desaguliers, L L. D. F. R. S. to Dr. Rutty, R. S. Secr.' 1728