32. Gunn. Arch. Int. Pharm. Ther., 1909, 19: 319.

33. Hale. U. S. Public Health and Marine-Hospital Service. Hyg. Lab. Bul. 53, p. 43.

34. Harrington. Amer. J. Phys., 1898, 1: 385.

35. Hatcher. J. Amer. Med. Assoc., 1910, 60: 746.

36. Henneguy. Diss. Montpellier, 1875.

37. Hofmeister. Arch. Exper. Path. Pharm., 1894, 33: 198.

38. Hoppe. Écho Méd. Neuchâtel, 1858.

39. Hunt. U. S. Public Health and Marine-Hospital Service. Hyg. Lab. Bul. 69, p. 51.

40. ——. Ibid., Bul. 33.

41. Igersheimer and Stami. Arch. Exper. Path. Pharm., 1909, 61: 18.