Merck &Co. is claiming that The Merck Manual of Medical Information: Home Editio>nThe Merck Manual of Diagnosis and Therapy, went on sale last December; sales in the first 10 days exceeded 100,000 copies. The publisher notes that sales are currently over the 500,000 mark and still climbing. Plans for a CD-ROM and Spanish-language version of the Home Edition are planned for later this year. Look for a Pocket Books mass market edition in September 1999 and, later, a trade paperback. Senior editor Nancy Miller, who handled the acquisition, noted that the books mesh well with other titles such as the Dr. Spock titles and the Physician's Desk Reference.