He swerved sharply left and dived toward a neighboring cloud. A cloud, while seeming from below to have both form and substance, is in reality but little different from a dense ground fog. It is enveloping, misty, eerie, and cuts off all visible contact with the world. If it covers a large air area, then the pilot may face some nice problems in correct and stable navigation, but if it is only a patch, he drives straight along his course, knowing that he will plunge out into the sunlight with the same suddenness with which he left it. Clouds are particularly welcome when Archie gunners begin to plaster the air with high explosive shells. As McGee came out of this cloud, his attention was drawn to a number of black bursts some three thousand feet below, but which clustered around a lone Nieuport flying at a forty-five degree angle to the line of flight which McGee was pursuing. That Archie crew knew their business, and McGee thought they appeared uncomfortably near the Nieuport. Then, as he watched, the Nieuport did a strange thing. Instead of making a sudden change in direction or a quick dive, either of which would compel the gunner to make another quick calculation in his range, it merely rolled once, then dipped twice, and proceeded on its way. The Archie fire ceased as suddenly as it had commenced. McGee streaked across another open patch of sky and entered another cloud. Coming out of this one he again spotted the lone Nieuport and corrected his own line to correspond with that of the lone flyer below. Now, studying it more closely, and with more time, he felt sure that it was Siddons' plane. One thing certain, the red, white and blue cockades established it as an American manned plane, and who, save a novice, McGee reasoned, would roll and make a slight dip to escape Archie fire. That particular battery must have been too convulsed by laughter to continue their fire. Had that stupid pilot, whoever he was, forgotten what he had been told concerning Archie fire? With the same surprising suddenness with which Archies always proclaim their presence, three more black puff balls inked the air directly ahead of the Nieuport. They were off the mark, but they furnished data for other guns which began filling the air. Evidently the gunners had not yet seen McGee, who was much higher and considerably behind the Nieuport, for they were concentrating on that plane. To McGee's surprise the Nieuport again rolled, then dipped twice, and the guns below immediately ceased firing. McGee decided it was time to seek the seclusion of a nearby cloud and while driving through it, do a little thinking.