THE NORMAL CURVE 55 



540 1-5437 • — Continued 



5401 and 5403, at locality 28, are sandy and 2*/& and 2 

 inches (6 and 5 cm.) respectively. 



5433 and 5434, at localities 26 to 28, are somewhat 

 sandy. 

 5438-5500. — The agreement among the three curves (the same, 

 and "13 N. H.") is very good in view of the dif- 

 ferent conditions under which the clays were 

 deposited in the Greenfield, Northampton, and 

 Hinsdale districts. The thick varves, at locality 7 29, 

 are sandy. 



5452, 5457, and 5495, at localities 26 to 28, are somewhat 

 sandy. 

 5501-5600. — Of the curves, one of which is from the Connecticut 

 ("13 N. H.") and the other from the Hudson Valley 

 ("13 N. Y. w ), neither is good. At locality 29, in the 

 Connecticut Valley, the sediments consist of silt 

 and sand deposited in a very narrow lake with a 

 strong current. In the Hudson Valley the material 

 from which the clay was derived was so fine that 

 the whole varve practically consists of fat clay, 

 and the varves consequently are difficult to dis- 

 tinguish. Furthermore, the clay is often slidden. 

 The series 5522 to 5537 is somewhat uncertain, 

 since the varve limits, in both valleys, are exceed- 

 ingly difficult to distinguish. On the whole, how- 

 ever, the two curves agree well. 

 5601-57 12. — Rather good. This series could not be found in 

 the Connecticut Valley. It is therefore borrowed 

 from measurements in the Hudson Valley. 



5671-5676 represent a very considerable drainage (cf. p. 99) 

 5713-5800.— The graph from the Hudson Valley (14 N. Y.) is 

 continued to show the connection with the New 

 England curves (14 Vt. and 14 N. H.). The cor- 

 respondence among them is rather good. Par- 

 ticularly interesting is the fact that most of the 



