In the article "Hepatic Cutaneous Porphyria," by Arnold C. Ratner and Richard L. Dobson, in the April, 1964, issue of the Archives, the following changes should be made.
Page 508: Delete the title of Table 3. In the last sentence under "Laboratory Methods" reference should be made to Table 2, not Table 3.
Page 509: The second sentence in the legends for Fig 1 and 2 should read "The numbers 1-12 along the abscissa represent the time periods shown in the left hand column of Table 3."
Page 512: Second column, second paragraph, third line should refer to Fig 4, not Fig 2.