Copy letter from Alfred H White to John Joly Discussion of Joly's paper for 'Proceedings of the Royal Society' - 'Observations on the spark discharge'. White clarifies that the Royal Society was inquiring about the illustrations accompanying the manuscript, namely whether the photographs were to be reproduced, and if white-on-black woodcuts would suffice for the pencil drawings. They will be glad to hear Joly's instructions on the matter without delay. 15 August 1889