WHO Expert Committee on Venereal Diseases and Treponematoses, Sixth Report, Technical Report Series, No. 736, by the World Health Organization. 141 pages, illustrated. World Health Organization, 1211 Geneva 27, Switzerland. 1986. $9.00.

Cuadernos de Geografia Medica de Guyana, Volume 1, edited by G. S. Volcan. viii + 146 pages, illustrated. Grafiset, S. R. L., Avenida Táchira No. 48, Quinta Magaly, Ciudad Bolívar, Estado Bolívar, Venezuela. 1986.

Weaning: Why, What, and When?, Nestlé Nutrition Workshop Series, Volume 10, edited by Angel Ballabriga and Jean Rey. xiii + 223 pages, illustrated. Raven Press, 1140 Avenue of the Americas, New York, New York 10036. 1986. $28.50.

Advances in Parasitology, Volume 25, edited by J. R. Baker and R. Muller. x + 335 pages, illustrated. Academic Press, Inc., Orlando, Florida 32887. 1986. $65.00.