to 1900-for the position indicated. The temperature and salinity were determined as described in the preceding pages.

Samples numbers 10, 20 and 22 were taken after heavy rains and therefore do not indicate the normal condition of the water. Samples numbers 24 and 25 were collected by E. L. Mark and were brought to Cambridge, where they were analyzed.

The pipette and burette used in Cambridge were not the ones used in Bermuda. The silver nitrate solution also was different and it was standardized against a different sample of Danish water. The agreement in the analytical results of samples 21 and 25, which were thus determined absolutely independently, serves to increase confidence in the reliability of all the analyses.

Discussion of Results.

The salinity of the water of the open ocean in the vicinity of Bermuda is undoubtedly that of the samples obtained off Nonsuch Island, namely 36.43 grams of salt per 1000 grams of sea-water. These samples were all collected outside the reefs, in positions exposed to the unbroken swell of the ocean from the south. In taking an average of the results, however, No. 19 has been omitted, as that sample was collected under unfavorable conditions. The depth below the surface, even down to 100 fathoms, appears to make no difference in salinity, except after recent rainfall.

The water of the shallow enclosed bays was found to increase in salinity with remoteness from the open ocean. This becomes particularly noticeable by comparing samples 2, 3, 4 and 9, where the successive samples were collected farther and farther within the shelter of the reefs and islands. The samples taken in Castle Harbor, also, were in good agreement with predictions based upon the connection of that bay with the ocean. The salinity of the water from the bottom of Harrington Sound, on the contrary, was surprisingly small, as compared with that of other enclosed bodies of water. It was found to be nearly the same as that of the open ocean, although the inlets to this sound are so narrow that the tide rises only about one fourth as much as it does outside.

Summary.

Data concerning the salinity and temperature of sea-water in the Bermudas are presented. These indicate that the salinity is independent of depth even down to 100 fathoms, but increases considerably as the water becomes more and more enclosed.

Proceedings of the American Academy of Arts and Sciences.

VOL. XLVIII. No. 19-MAY, 1913.

ON CERTAIN FRAGMENTS OF THE PRE-SOCRATICS:

CRITICAL NOTES AND ELUCIDATIONS.

BY WILLIAM ARTHUR HEIDEL,

PROFESSOR OF GREEK IN WESLEYAN UNIVERSITY.