PHYSICAL INVESTIGATIONS OFF THE NEW ENGLAND COAST. 
405 
September 3, 1889. (Tdble 22 and Plate 22.) — The air curve on the Grampus evi- 
dently participated in the general movement which was going on, as shown by the air 
curves. The increase in temperature, as shown by the water curve at 15 hours, is 
very suddeu, although a general increase was noticeable all through the a. m. from 4 
hours onward at station H 3. 
September 4, 1889. (Table 23 and Plate 23.) -The sun’s rays were on the box again 
at 14 hours, but this would not account for all of the midday elevations, as there was 
a decided rise in the temperature before this time. The great irregularity of the 
water curve is striking, though in general it is high, as is to be expected in this 
region. The great coincidence of all the air curves is rather remarkable. 
September 5, 1889. (Table 24 and Plate 24.) — The sun was on the thermometer 
box from 10 to 17 hours, as we were sailing due north, and thus on this day the air 
curve eclipses those of both Boston and New York. There were no clouds except in 
the a. m., and this must have had some effect upon the water temperature, but it is 
' hard to believe that it was as decided as indicated by the water curve between 12 
and 18 honrs, though it is possible. 
September 6, 1889. (Table 25 and Plate 25.) — A cloudless day and with very little 
wind. The sun’s rays were upon the thermometer box again from 8 to 12 hours, and 
the air curve once more follows the New York and Boston curves closely. The water 
curve commenced to go down last night, and the descent continued until station G 2, 
No. 136, was reached, when we were in shoal water offshore, and should expect a rise 
in temperature on such a hot day so near the shore. 
We went into Wood’s Holl after this, and severe storms prevented our making 
any more trips, thus closing the work for the s'easou. 
THE RECORDS OF SERIAL TEMPERATURES AND DENSITIES. 
In the preparation of the plates which illustrate this portion of the report, only 
such of the lines were used as were completed within a reasonably short time of one 
another. It would not be right to place upon the same profile sheet observations 
made at intervals of several days, since changes produced in just such intervals were 
the subject of our study. We were able to complete but seven separate lines at right 
angles to the coast, within what seemed satisfactory timelimits (36 to 48 hours). Two 
of these lines (G and H) were repeated under the same conditions, and hence only 
these nine profiles are given. Further, it would not be proper to compare too closely 
all of those charts with one another, because they were made at such wide intervals 
of time that the connection between them is broken through a change in season and 
other conditions. The most important series were those made along lines G, H, J, 
and K, which were completed between August 17 and September 6. During this 
period we were favored with good weather and were enabled to complete four lines 
and repeat two of them. The six profiles representing these lines are given first. The 
other three profiles represent the lines farther to the eastward and lose some of their 
interest from the fact that we were not able to repeat any of them during the season 
on account of the weather. Furthermore, while we were making these latter lines, 
we were experimenting upoti the proper location, or the best intervals upon the wire, 
for our thermometers. It will be seen later on that we missed one very prominent 
feature in the temperature relations in our early work from this fact. 
