8 THR CONDOR Vol. XIX 



birds will suddenly return to the fissures in the rocks, and there seems to be 

 nothing that will cause them to leave their selected roosting cavities. In the 

 district lying within four miles around SI over Mountain I have never seen the 

 swifts more than one mile distant from it. 



During the extremely cold wave of early January, 1913, eight, to me per- 

 fectly healthy, swifts were taken out of a crevice where they, with many oth- 

 ers, seemed to be roosting in a dazed or numb state. They were kept in a room 

 for about six hours and then turned loose, one at a time, a few hundred feet 

 from the point where they were captured. All flew away in a dazed fashion 

 and nearer the ground than usual and none were observed to return to the 

 place where they were captured. I had hitherto thought that they were numb 

 from the cold, or possibly from the jar of a blast in their immediate vicinity; 

 but it has been suggested to me that possibly they were hibernating. This 

 raises a very interesting question, as it seems possible that these birds have in- 

 termittent hibernation periods. The facts are that these birds are not observed 

 for many days in the coldest weather, yet are found to be plentiful within the 

 rocks, in a dormant state. 



It is claimed by some that these birds do not use their wings in unison, but 

 I am of the opinion that they do flap both wings at the same time, at least part 

 of the time if not always. When flying about feeding upon insects, usually at 

 several hundred feet elevation above the ground, they make a few rapid beats 

 with the wings, then soar a little while, then beat their wings rapidly for a few 

 moments and so on. They vary the flight by sharp darts in other directions, 

 probably to catch insects. When returning to the cliffs they often keep their 

 wings beating fairly steadily. Both when penetrating and leaving the crevices 

 they seem to use both their wings and feet as aids to locomotion. 



Set no. 3 was donated to the United States National Museum (Accession 

 60163), where it proved the first set of eggs of this species in that institution. 

 Set no. 5 was donated to the American Museum of Natural History where 

 there had been no eggs of the White-throated Swift previously. Set no. 4 was 

 donated to the California Museum of Vertebrate Zoology (now no. 1632 of the 

 oological collection there). 



Colton, California, November 14, 1916. 



BIRDS OF THE HUMID COAST 



By FLORENCE MERRIAM BAILEY 

 I. FISHERMEN 



THE HUMID COAST of the Northwest appeals to the imagination of the 

 worker from the arid interior not only because of its phenomenal forest 

 growth — its bearded giants towering from one to two hundred feet above 

 an almost impenetrable jungle — but because of the ornithological antitheses 

 that result from the juxtaposition of ocean and forested mountains in northern 

 latitudes. 



On Tillamook Bay in northwestern Oregon, reached from Portland by 

 winding down through the Coast Mountains with their lofty conifers and their 

 canyon streams frequented by Water Ouzels, the shore that is strewn with the 

 trunks of headless giants is so close beset by the living forest that the bird stu- 



