BOTANICAL GAZETTE. 79 wet. Mr. Meehan suggests that by taking sections at different places in the same log we would find the same layer bearing all kinds of testimony. The writer has heard classes gravely informed that the above was the fact, and also that the rings of growth found in fossil trees necessarily indicated seasons of cold and warmth. In the last instance a bright boy rather nonplussed the teacher by asking if there were no exogenous trees in the tropics.