Magnetic susceptibility measurements in dilute alloys of Nd, Gd, Tb, and Er with Y at temperatures between 1.5 and 20 deg K are presented. All the alloys were paramagnetic at liquid hydrogen temperatures and showed sharp transitions to antiferromagnetism at lower temperatures except Y-Er, which must have a transition below 1 deg K. The Neel points determined from the reciprocal susceptibility vs temperature curves are given. Experimental Curie constants are compared with calculated values for the alloys. (C.E.S.)