Note 85 — Sermons in Stones.

Any one who desires to see the extent to which science can find employment in this arid-looking corner of organic life, may look at a "Memoir on the Spermogones and Pycnides of Filamentous, Fruticulose, and Foliaceous Lichens," by Dr William Lauder Lindsay, in the 22d volume of the Transactions of the Royal Society of Edinburgh.