51. Lehmann, C. G. Lehrbuch für physiolische Chemie, 1842, 1: 336.

52. Lehmann, J. Ann. chim. pharm., 1853, 87: 205.

53. Leven. Arch. Phys., 1868, 1: 180.

54. Livon. Compt. rend. Soc. biol., 1897, 4: 979.

55. Maurel. Compt. rend. Soc. biol., 1907, 62: 897.

56. ——. Ibid., 1909, 66: 782.

57. ——. Ibid., 1910, 69: 5.

58. Meltzer and Auer. J. Exper. Med., 1905, 7: 59.

59. Mitchell. J. Phys., 1862, 5: 109.

60. Mitscherlich. Diss. Berlin, 1859.