His lips pursed in a prolonged, soundless whistle. But he did not linger. Immediately after he had estimated the visible length and dip of the seam, he began his descent. Arriving at the foot without accident, he picked up the level rod and swung away down the gulch.

He saw nothing of Ashton until he had come all the distance down across the valley to the dike above the pool. His assistant was in the grove below, assiduously helping Miss Knowles to erect a tent that the girl had improvised from a tarpaulin. Genevieve and Thomas Herbert were interesting themselves in the contents of the kit-box. The two ladies had ridden up to the camp on horseback, Isobel carrying the baby.

When Blake came striding down to them, the girl 188 left Ashton and ran to meet him, her eyes beaming with affectionate welcome.

“What has kept you so long?” she called. “Lafe says the gulch is absolutely unclimbable. I could have told you so, beforehand.”

“You are right. I tried it, but had to quit,” replied Blake, engulfing her outstretched hand in his big palm.

When he would have released her, she caught his fingers and held fast, so that they came down to his wife hand in hand. Oblivious of Ashton’s frown, the girl dimpled at Mrs. Blake.

“Here he is, Genevieve,” she said. “We have him corralled for the rest of the morning.”

“Sorry,” replied Blake, stooping to pick up his chuckling son. “We can’t knock off now.”

“But if you cannot continue your levels?” asked his wife. “From what Lafayette told us, we thought you would not start in again until after lunch.”

“No more levels until tomorrow,” said Blake. “But I must settle one of my big ‘ifs’ by night. To do it, Ashton and I will have to go up on High Mesa and measure a line. There’s still two hours till noon. We’ll borrow your saddle ponies, Miss Chuckie, and start at once, if Jenny will put us up a bite of lunch.”