[8] Tuckerman's Genera Lichenum, Introduction, p. v.
[9] Carpenter's Human Physiology, p. 455.
[10] Nicholson, Study of Biology, p. 79.
[11] Popular Science Monthly, August, 1872, p. 411.
[12] Sleep and its Derangements, pp. 9, 10, 13.
[8] Tuckerman's Genera Lichenum, Introduction, p. v.
[9] Carpenter's Human Physiology, p. 455.
[10] Nicholson, Study of Biology, p. 79.
[11] Popular Science Monthly, August, 1872, p. 411.
[12] Sleep and its Derangements, pp. 9, 10, 13.