[13] THE BOTTOM OF THE GULF STKEAM. 1057 



EXPLANATION OF THE PLATES. 

 Plate I. 



Sketch map of the sonthern coast of New England to the Gulf Stream Slope, showing 

 lines of depth and the position of the principal dredging stations of the United 

 States Fish Commission, 1880-1882, and some of those of 1871, 1874, and 1875. 

 The crosses indicate dredging stations, part of which are accompanied by their 

 serial numbers, corresponding to the records and published lists. Those bearing 

 numbers between 309 and 347 were occupied by the Blake in 1880. 



Plate II. 



To illustrate the relative slope or profile of the bottom from the shore to the Gulf 

 Stream Slope and across portions of the slope in several lines. Vertical to hori- 

 zontal scale, 1 : 360. The line n' — o' shows the actual slope along the line n — o. 

 The vertical shading indicates the position of the comparatively warm water 

 both of the surface and of the Gulf Stream ; oblique shading to the right indicates 

 the cold water of the shallow plateau; oblique to the left the cold water of the 

 greater depths. 



Plate in. 



Temperature-curves at the bottom and surface (o), and at 5, 10, and 20 fathoms in 

 the same localities. The curves of the bottom-temperatures extend from the 

 shore to near the 800-fathom line on the Gulf Stream Slope. The position of each 

 station is indicated by the total depth placed at the head of the vertical columns. 



Plate IV. 



Temperature-curves at the surface and bottom, and at the intermediate depths of 5^ 

 10, 20, 30, and 50 fathoms, arranged according to the distance in miles from the 

 shore. The observations were made on three different days, as indicated by the 

 letters a— a, i — i, o — c. The dotted lines indicate breaks in the actual series of 

 observations. The numbers are those of the recorded stations where the obser- 

 vations were made. 



Plate V. 



Temperature-curves at the bottom and surface (o), and at the intermediate depths of 

 5, 10, 20, 30, 50, and 100 fathoms. These observations were all made September 

 14, 1881. This illustrates the rise in temperature between 30 and 50 fathoms from 

 the surface. 



These plates were prepared to illustrate articles published by mo in 

 " Science," in 1882. I am indebted to the editor, Mr. S. H. Scudder, for 

 the opportunity of using them in this place. 

 S. Mis. 46 67 



