"Does it make any difference," asked Jack, "whether the long way is up and down, or to the right and left?"
"None. You can make the openings long either way and short either way."
"Good!" answered Jack. "Then I'll make them long to right and left and short in their up and down dimensions, so that I shall have to saw out only two logs for each window."
Jack went immediately to work. He split out six or eight boards, each four times the thickness of any ordinary clapboard, and, taking a handful of the small supply of nails on hand, went to the cabin now well advanced in construction, and selected the places for the two window openings. Then he nailed the thick boards securely to the logs, one on each side of one of the proposed window openings. The boards were long enough to reach over four of the logs. Jack nailed them securely to all four of the logs, thus binding the timbers together, and making each a support to all of the others. Then he sawed out three-foot lengths of the two middle logs, leaving their ends securely supported by the boards which were firmly nailed to them, and also to the uncut logs above and below. Then, to make all secure, he fitted pieces of his thick boards to the ends of the sawed logs, and nailed them firmly into place as an additional protection against sagging.
"Now, then, Doctor," he called out, "come on with your windows. I'm curious to see what they are like."
"In a minute," answered the Doctor, who was busy with his materials on a log in front of the house. He had taken two strips of thin yard-wide muslin each a little over four feet long, and with the inside of a bacon rind he was busily greasing them.
The result of the greasing was to render the thin cotton fabric quite translucent, and indeed, almost transparent. With tacks, of which there was a small supply in the Doctor's own pack, he securely fastened one of these pieces of greased muslin on the outside of the window opening that Jack had made, and the other on the inside, leaving a space of several inches between.
"There," he said, when all was done, "that will let in light almost as well as glass could do, and it will keep out wind and cold even better than the logs you sawed away could have done, no matter how well chinked and daubed they might have been."
Then he and Jack proceeded to deal with the other window opening in the same way. By the time that they had done the boys were clamorously calling them to supper, and they were not reluctant to answer the summons. By this time the roof was on the house and a door of clapboards, split out of double thickness, was hung by hinges made of limber twigs, called withes, to pegs in the logs, and supplied with a wooden latch, catching into a wooden slot. The door opening was made precisely as the window holes were. The mountain form of log cabin involved the least possible use of metal in its construction, and except for the nails used in making the door and windows this one had involved the use of no metal at all. It was not all done, by any means, but at least its outer shell was done after two days of hard work, and the rest could be safely left till the morrow—all of it, except one thing, of which Jack was mindful during supper.