$20 Prof. Bache’s Lecture on the Gulf Stream, 
the point of beginning. In the first (see diagram No. 4, Plate I)” 
the temperatures are marked on the vertical lines at the left side 
of the diagrams, the ordinates of the curves thus corresponding 
to temperatures. In the second (see diagram No. 9, Plate I,) 
the depths are similarly written, the ordinates thus corresponding 
to depths. The notes or legend, show in the first case to what 
depths the curves correspond and in the second to what temper- 
atures. The observations at each position being plotted accord- 
ing to its temperature or depth in the two classes of diagrams, 
the curve is drawn with a free hand among the points. 
It should be observed that the discussion of each season’s ob- 
servations was in general made separately, and that the result of 
one, two or three seasons, grouped, were announced separately, 
leaving to the new observations to confirm, or refute, the con- 
clusions drawn. It isa remarkable fact that with such difficul- 
tiesin the way, in the character of the phenomena to be observed, 
in the diversity of seasons and of observers, the phenomena. 
have always been readily deducible from the observations, and 
that the separate discussions have been confirmations, the follow- 
ing of the preceding; in short that the nature of the medium 
in which the work has been performed in its relations to heat, 
has more than compensated for other difficulties and that the 
results are more accordant than the elaborate ones obtained from 
wbridge, Assistant U.S. Coast Survey, who has made 
a general review of the whole of the results preparatory to their 
permeation in a volume of the Records and Results of the Coast 
urvey. 
IV. Resvtrs. 
1. Type-curves of law of temperature with depths at the most charac- 
teristic positions.—The two most characteristic positions are Int 
cold current between the land and the Gulf Stream and in the 
“ x the stream itself. ug 
- Diagram No. 1, Plate I, is a specimen of the type-curve In 
the cold current. The long baican ten the ee about 50 
fathoms in depth is the overflow of the warm water of the Gulf 
S the temperature varying from 81° to about 55°. The 
