On embarking in the morning, the wind was slightly ahead, which continued during the forenoon, changing in the after-part of the day, so that we were able to hoist sail. About four o'clock the weather became cloudy and hazy, the wind increasing, at the same time attended with thunder and lightning. A storm was rapidly gathering, and the lake became so much agitated that we immediately effected a landing, which was not done without some difficulty, on a shallow and dangerous shore, thickly strewn with boulders. We pitched our tents on a small peninsula, or narrow neck of land, covered with beautiful forest-trees, which was nearly separated from the main shore. Shortly after our arrival a vessel hove in sight, and anchored on the same dangerous lee shore. We were in momently expectation of her being driven from her moorings, but were happily relieved, the next morning, to observe that she had rode out the storm. The lake was still too rough on the following day, and the wind too high, to permit our embarking. We made an excursion inland. The country proved low, undulatory, and swampy. The forest consisted of hemlock, birch, ash, oak, and maple, with several species of mosses, which gave it a cold, bleak character. The margin of the forest was skirted with the bulrush, briza canadensis, and other aquatic plants. The whole day passed, a night, and another day, with nothing but the loud sounding lake roar in our ears. A heavy bed of the erratic block formation commences at this point, and continues to Point aux Barques, the eastern cape of Saganaw Bay. In one of these displaced masses--a boulder of mica slate, I discovered well-defined crystals of staurotide. This formed my second mineralogical acquisition.[17] There were, also, some striking water-worn masses of granitical and hornblende porphyry. [17] In passing along this coast in 1824, an Indian picked up, in shallow water, a small boulder imbedding a mass of native silver. Breaking off the most prominent mass, he still observed the metal forming veins in the rock, and brought both specimens to an officer of the British Indian department at Amherst (Lieut. Lewis S. Johnson), who presented them to me. This discovery is described in the _Annals of the New York Lyceum of Natural History_, vol. i. part 8, page 247.