ABSTRACTS AND DISCUSSIONS OP PAPERS 67 



drainage and associated problems, and that lie can now present to us the ripe 

 conclusion of his long and careful study. The generalizations based on such 

 detailed and long-continued work are the generalizations which we have come 

 to trust. The fact that his conclusions tie up harmoniously the conclusions 

 of many individual workers who have studied local areas intensively is grati- 

 fying and seems to be good evidence of the soundness of the results at which 

 Professor Fairchild has arrived. I have but one comment to add. I think 

 the east end of isobase O will have to be shifted somewhat farther south. 



Professor Fairchild replied briefly to Professor Spencer's and Salis- 

 bury's remarks. 



STUDIES OF GLAC1ATION IN THE WHITE MOUNTAINS OF NEW HAMPSHIRE 

 BY JAMES WALTEK GOLDTHWAIT 



(Abstract) 



The field studied in 1915 is the northwestern part of the White Mountains, 

 more particularly the Ammonoosuc Valley between Littleton and Bretton 

 Woods. It is the purpose of the paper to show that glacial phenomena, which 

 were regarded by Louis Agassiz and by Charles H. Hitchcock as records of 

 local mountain glaciers, and by Warren TJpham as records of a local White 

 Mountain ice-cap, remaining at the close of the last Glacial epoch, are in 

 reality records of the North American ice-sheet, which retired into Canada 

 without leaving either mountain glaciers or a local ice-cap in its wake. Stria*, 

 dispersion of boulders, terminal moraines, outwash plains and kame terraces, 

 mapped in detail, are offered as evidence. 



Observations on the Mount Washington Range, the Franconia Mountains, 

 and Mount Moosilauke support the view advanced in 1912, that there were 

 cirque cutting glaciers in the White Mountains at a time prior to the last 

 regional glaciation, but that these glaciers were small and not very numerous. 



Presented by title in the absence of the author. 



GLACIATION AND STORMY PERIOD OF THE FOURTEENTH CENTURY 

 BY ELLSWORTH HUNTINGTON 



{Abstract) 



A recent study of the salt lakes at the eastern base of the Sierra Nevada s 

 shows that their later strands can be dated in terms of the growth of the big 

 trees on the other side of the mountains. Gale has shown that chemical evi- 

 dence indicates that Owens Lake must have overflowed not more than "4,000 

 years ago or considerably less," Jones has shown the same to be true of 

 Pyramid Lake. Since they did not use the entire drainage area and made no 

 allowance for increased solution of mineral matter from the rocks with in- 

 creased precipitation, it seems necessary to reduce the time to approximately 

 2,000 years. In that period Owens Lake has decreased to 40 per cent of its 

 former size, and Pyramid has similarly shrunk, although not so much. Below 

 the old outlet strands there is in each case a series of younger strands whose 



