Circle T. 

 But not for long. 

 Five days after Sally's ignominious dismissal from the armed forces, a staff car came racing up to the ranch. It skidded to a halt at the back-porch steps. Dr. Peterson jumped out and dashed up to the kitchen door. 

 "Well, for heaven's sake," Hetty cried. "Come on in, sonny. I ain't seen you for the longest spell." 

 Peterson entered and looked around. 

 "Where's Johnny, Mrs. Thompson?" he asked excitedly. "I've got some wonderful news." 

 "Now ain't that nice," Hetty exclaimed. "Your wife have a new baby or something? Johnny's down at the barn. I'll call him for you." She moved towards the door. 

 "Never mind," Peterson said, darting out the door, "I'll go down to the barn." He jumped from the porch and ran across the yard. 

 He found Johnny in the barn, rigging a new block and tackle for the hayloft. Barney was helping thread the new, manila line from a coil on the straw-littered floor. 

 "Johnny, we've found it," Peterson shouted jubilantly as he burst into the barn. 

 "Why, Doc, good to see you again," Johnny said. "Found what?" 

 "The secret of Sally's milk," Peterson cried. He looked wildly around the barn. "Where is she?" 

 "Who?" 

 "Sally, of course," the scientist yelped. 

 "Oh, she's down in the lower pasture with Queenie," Johnny replied. 

 "She's all right, isn't she?" Peterson asked anxiously. 

 "Oh, sure, she's fine, Doc. Why?" 

 "Listen," Peterson said hurriedly, "our people think they've stumbled on something. Now we still don't know what's in those eggs or in Sally's milk that make them react as they do. All we've been able to find is some strange isotope but we don't know how to reproduce it or synthesize it. 

 "But we do think we know what made Sally give that 

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