Sentence:  He is just about sailing for Europe, with all his family, for a two years' tour, and with <WSD>"Parkomania</WSD>" especially in his mind. There is no man of all my acquaintance so thoroughly prepared to see and enjoy the finest English places. Rare trees are his special hobby. 
Meaning of the word marked with <WSD> tags:  Interest in parks and gardens; a fashion for lawns and parks.