Described is a scaling theory of spin-glasses which has both longitudinal (q// L-SCRIPT ) and transverse (q//t) order parameters. The form of the term coupling these parameters is deduced by requiring the longitudinal but not the transverse transition to be suppressed in a field. If the large field susceptibility corresponds to // chi approx. h**2/** delta then the transverse freezing, or Gabay-Toulouse, temperature is found to obey a scaling law t//T approx. h 4/** delta . For mean-field delta equals 2 to give t//T approx. h**2, in agreement with Gabay and Toulouse.