REVIEW OF "THE LAW OF INTERSTELLAR EXTINCTION IN ORION" BY JOHNSON & MENDOZA (1964) AND ON "THE EXTINCTION LAW IN THE ORION NEBULA" BY COSTERO & PEIMBERT (1970)

We review the papers The Law of Interstellar Extinction in Orion by H. Johnson and E. E. Mendoza, 1964, BOTT, 3, 25, 331 and The Extinction Law in the Orion Nebula by R. Costero and M. Peimbert, 1970, BOTT, 5, 34, 229. Each review is preceded by a brief account of the professional relationship between the authors.