Letter from J S Risien Russell, to John William Strutt, 3rd Baron Rayleigh, regarding a paper 'An experimental investigation of the nerve roots which enter into the formation of the lumbo-sacral plexus of Macacus rhesus' by J S Risien Russell Responds to each of the criticisms in turn. Argues for the inclusion of both plexus figures. Corrects a misunderstanding arising from one of the diagrams. Subject: Physiology [Published in the 'Proceedings of the Royal Society of London', 1894] 3 July 1893