"Are they especially venomous, then?" the boy asked, growing serious.

"No, but they are especially numerous. Many a man has gone mad on the trail because he had no protection from them. That, practically, wiped out of existence one of the largest gold-hunting parties that ever came to Alaska."

"Tell us about it, Mr. Rivers," urged Roger.

"Well, I will," the chief replied, "if it is only to give you a due respect for your enemies. This party of which I am speaking had landed on Kotzebue Sound, and having heard of an alleged Indian trail to the Koyukuk, somewhere near the Selawik River, and having found out beside that it was tundra and flat, they thought it would be easy traveling."

Here Magee chuckled audibly at the idea of tundra being easy going.

"It wasn't long," went on the chief, not noticing the interruption, "before they reached the tundra and discovered that it was scarcely as pleasant as they thought. Walking on tundra is like, is like,—tell him what it's like, Magee."

"It's like walking over slippery footballs half-sunk in slime," said the Irishman promptly.

"Well, that will do," said Rivers. "Any way, they were tramping over this and losing heart fast when the mosquitoes began. They had nothing with them which would serve to keep off the insects, and some of the party were stung so fearfully that a superficial form of blood poisoning set in. Others, unable to endure the torture night and day, killed themselves; others again went insane and became violent; of that large party but two returned to the coast, one who by some freak of nature was immune, and his chum, who had become half-witted by the experience."

"You bet," commented the topographer, "the Alaskan mosquito is a matter to be taken very seriously."

In spite of the general opinion so strongly expressed, Roger felt a little scornful about being bothered with a few pesky mosquitoes, and he was inclined to think it an utterly foolish precaution when he was given an arrangement of netting to put over his head and let it hang down well over his shoulders, but his scorn vanished rapidly. Within an hour his hands, unprotected by gloves, became puffed and swollen from bites, and he found it necessary to put on thick buckskin to preserve him from the bites and to keep his sleeves rolled down. Even then he was not entirely free, for in some mysterious way the insects would work themselves into his clothes, and at night, although the tent was placed on a canvas which fastened to its sides like a floor, so that the mosquitoes could not come up from underneath, a few of them always were to be heard—and felt. So that, before many days had passed, Rogers was convinced that the Alaskan mosquito was a very important factor in life on the trail.