The last week of February turned out to be the peak of the maple-sugaring season that winter, and an inch of snow remained on the ground as the juniors in my chemistry class disembarked from the bus. Kevin, our guide, met us with empty buckets, and he talked about the trees as we took a short walk around. The students ran their hands over the bark of the oaks, beeches, and maples with an uncharacteristic quietness as our guide talked about the different types of trees in Cadwalader Park.