A HUNDRED dollars a month-it's a fortune " Jean Bruce exclaimed gayly, pirouetting about on her tip-toes in front of a huge Japanese umbrella fastened upright in the ground in the middle of the orchard at the Rainbow Ranch. Jacqueline Ralston gazed half convinced at the sheet of paper she held in her hand. She was sitting in Turkish fashion on the grass just outside the umbrella and, as her Mexican hat had been flung aside, the spring sun shone directly...