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For the magnificent photograph of Orion's nebula, forming the Frontispiece, I am indebted to the courtesy of Mr. Isaac Roberts, F.R.A.S., who most kindly lent me the plate for reproduction; and I have had the great good fortune to obtain permission from MM.

F.R.A.S., tries to figure out where to land on the moon.

It is called, Watched by the Dead: A Loving Study of Charles Dickens's half-told Tale, 1887, and was written by R. A. Proctor, F.R.A.S., the Astronomer, whose untimely death from fever in America was announced after our return from our week's tramp.

F.R.A.S., has an original seal with a head of Sir William Herschel, which is shown on the title-page of this work.

Finally, my best thanks are due to Mr. John Ellard Gore, F.R.A.S.,