"We then climbed up the brook to get to the Leptaena rhomboidalis beds but a heavy rain returned us and we had to give it by. Returning to Mrs Johnson's house where we are staying, we came across another small brook, and here we had a clear view of the transition gone from the dark Ditica shales, to the blue shales of the Eden. The Ditica is a dark shale and in the brook breaks out in patches or that the walls recede anywhay. Then follows a zone about 10 feet thick in which there is an alter- nation of red shales with blue shales, followed higher place blue shales which crumple away making a once rounded and more rapidly receding bank. Williams read his barometer here and grades the Ditica above the limestone at lake level about 80 feet thick. I will study these beds again tomorrow while Williams will go to the top of the mountain to get the total thick- ness of the "London River" above the Ditica,