Paper, 'An account of an experiment made before the Royal Society December 14 1721, to shew that when a heterogeneous body descends in a fluid with an uniform motion, the whole weight of the body is communicated to the fluid; whereby the pressure of the fluid upon any subjacent body is encreas'd, not only in proportion to its absolute weight; tho in the beginning of the fall (whilst the body was accelerating its motion) the whole weight of the body was not communicated to the fluid' by J T [John Theophilus] Desaguliers Desaguliers describes an experiment into fluid dynamics regarding the descent of a body in fluid with a uniform motion. Conclusions in reply to G H Rastius's objections concerning Leibnitz's new principle for explaining the cause of the variation of the height of the mercury in the barometer. Includes one diagram of experimental apparatus. Subject: Physics Read to the Royal Society on 11 January 1721 1721