66 THE ARCTIC PRAIRIES 



frog gave the same result. Why? It can hardly be 

 because the frog is cold-blooded, for many birds also 

 seem to be immune, and their blood is warmer than 

 man's. 



Next, I took a live frog and rubbed it on my hand 

 over an area marked out with lead pencil; at first 

 the place was wet, but in a few seconds dry and 

 rather shiny. I held up my hand till 50 mos- 

 quitoes had alighted on it and begun to bore; of 

 these, 4 alighted on the froggy place, 3 at once 

 tumbled off in haste, but one, No. 32, did sting me 

 there. I put my tongue to the frog's back; it was 

 slightly bitter. 



I took a black-gilled fungus from a manure pile 

 to-day, rubbed a small area, and held my hand bare 

 till 50 mosquitoes had settled and begun to sting; 7 of 

 these alighted on the fungus juice, but moved off at 

 once, except the last; it stung, but at that time the 

 juice was dry. 



Many other creatures, including some birds, enjoy 

 immunity, but I note that mosquitoes did attack a 

 dead crane; also they swarmed onto a widgeon plucked 

 while yet warm, and bored in deep; but I did not see 

 any filling with blood. 



There is another kind of immunity that is equally 

 important and obscure. In the summer of 1904, Dr. 

 Clinton L. Bagg, of New York, went to Newfoundland 

 for a fishing trip. The Codroy country was, as usual, 

 plagued Math mosquitoes, but as soon as the party 

 crossed into the Garnish River Valley, a land of woods 

 and swamps like the other, the mosquitoes had dis- 



