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 Rh edited by his cousin, Mrs Lydia Fisher, and published a few years after his death. My indebtedness to this volume in what follows will be apparent.

William Henry Harvey came of the old Quaker stock that has given to Ireland several of her most enthusiastic naturalists. To this group belong Thomas Wright of Cork, Joseph Wright of Belfast, Greenwood Pim of Dublin; all of whom, immersed in affairs of business, devoted their leisure hours to science, and progressed far in the branches of zoology or botany to which they addressed themselves. Harvey's family belonged to Youghal, on the coast of Co. Cork. His father was a well-known merchant of Limerick, in which town he himself was born, the youngest of eleven children, just a hundred years ago in February 1811. Even as a child, his love of natural history made itself apparent, and fortunately his schooling tended to foster this taste. After a few years at Newtown near Waterford, he went to the historic school of Ballitore, in the county of Kildare. These Irish Quaker schools have long favoured the teaching of science, and Ballitore at that time was no exception. The head master was James White, a keen naturalist, and himself a writer on Irish botany ; and probably the encouragement that young Harvey received at Ballitore had much to do with the shaping of his life. At the age of fifteen, we find him writing of his collection of butterflies and shells, and already referring to the group in which he subsequently achieved his greatest fame:—

"I also intend to study my favourite and useless class, Cryptogamia. I think I hear thee say, Tut-tut! But no matter. To be useless, various, and abstruse, is a sufficient recommendation of a science to make it pleasing to me. I don't know how I shall ever find out the different genera of mosses. Lichens I think will be easy" (he little knew them!) "but fungi I shall not attempt; not at all from their difficulty, but only because they are not easily preserved. But do not say that the study of Cryptogamia is useless. Remember that it was from the genus Fucus that iodine was discovered."

Another letter of this period, written when he was sixteen,