A public lecture on "Site Planning for Low-cost Housing" will be given at the Harvard University School of City Planning this morning at 11 o'clock, by Henry Wright, of New York, N., Y., noted architect who assisted in the development of the model town of Radburn N. J., and the Buhl Foundation Housing Project of Pittsburgh, Pa. Mr. Wright holds the opinion that row houses in small units are preferable to struggle family houses for low-cost housing. He was in charge of the site planning of Radburn, the so-called "New Town for the Motor Age".