2o6 Report of the Broivn-Harvard Expedition. 



69. Fasserella iliaca. Fox Sparrow. Very common as far as Mokko- 



vik. Breeds abundantly. 



70. Dendroica coronata. Myrtle Warbler. Locally common to 



Mokkovik. 



71. Dendroica striata. Black-poll Warbler. Abundant as far as Hope- 



dale. A very characteristic bird. 



72. Seiurus noveboraeensis. Water Thrush. Not uncommon as far 



as Mokkovik. 



73. Anthus pensilvanicus. Titlark. Very abundant everywhere in 



the more barren regions and on the islands. 



74. Regulus satrapa. Golden-crown Kinglet. Rather common in 



wooded places. North to Mokkovik. 



75. Parus hudsonicus. Hudsonian Chickadee. Rare. Two or three 



at Manak. 



76. Turdus alicise bicknelli. Bicknell's Thrush. One taken near 



Battle Harbor. 



77. Turdus ustulatus swainsoni. Olive-backed Thrush. Rather com- 



mon wherever there were trees, as far as Mokkovik. 



78. Merula migratoria. Robin. Rather uncommon. Common at 



Manvers September 6th to 8th. 



79. Saxicola oenanthe. Wheatear. The agent at Nachvak had nests 



of this bird, which he had taken. 



X. 



REPORT ON GEOLOGY. 

 BY REGINALD A. DALY, PH. D. 



The "Paradise of Geologists" is undoubtedly the great 

 arid belt of the United States. The interpretation of 

 the structure and history of the earth's crust is there pos- 

 sible with a degree of rapidity and an amount of assured 

 detail which are scarcely possible in any other region of the 

 globe. A chief cause for this facility of study is to be found 

 in a very general lack of forest and even of the soil-cap, 

 which so seriously interfere with the work of the observer 

 elsewhere. This same condition is supplied also in the 



I 



