Observations of Latitude and Variation, Taken on Board the Hartford, in Her Passage from Java Head to St. Hellena, Anno Dom. 173 1/2 Communicated by Edmund Halley, LL. D. Regius Astronomer at Greenwich

explaining, in some of the most remarkable Animal Motions, some time hereafter, at greater Length than this present Occasion will admit of. VI. Observations of Latitude and Variation, taken on Board the Hartford, in her Passage from Java Head to St. Hellena, Anno Dom. 173½. Communicated by Edmund Halley, LL.D. Regius Astronomer at Greenwich. On Wednesday, February the 2d, we took our Departure from Java Head, allowing it to lie in the Latitude of 6° 45' South. Monday, February 7. By a good Amplitude made 3° 28' Variat. NWly. Latitude by Account 9 59 South. Merid. Dist. from Java Head 43 West. Longitude from ditto 45 Sunday, February 13. By a good Azimuth made 4° 45' Variat. NWly. Latitude by good Observat. 13 43 South. Merid Dist. from Java Head 3 31 West. Longitude from ditto 3 36 Tuesday, February 15. By a good Amplitude 4° 52' Variat. NWly. Latitude per Observation 15 18 South. Merid. Dist. from Java Head 6 1 West. Longitude from ditto 6 95 Monday, February 21. By a good Azimuth and Amplitude $4^\circ 51'$ Variat.NW. Latitude per Observation $18^\circ 12'$ South. Merid. Dist. from Java Head $17^\circ 28'$ West. Longitude from ditto $18^\circ 00'$ Friday, February 25. By a good Amplitude made $6^\circ 8'$ Variat.NW. Latitude per Observation $19^\circ 59'$ South. Merid. Dist. from Java Head $21^\circ 17'$ West. Longitude from ditto $22^\circ 15'$ Tuesday, February 29. By a good Azimuth $10^\circ 3'$ Variat.NW. Latitude per Observation $21^\circ 00'$ South. Merid. Dist. from Java Head $30^\circ 28'$ West. Longitude from ditto $32^\circ 12'$ Sunday, March 5. By a good Amplitude made $15^\circ 15'$ Variat.NW. Latitude per Observation $23^\circ 16'$ South. Merid. Dist. from Java Head $37^\circ 18'$ West. Longitude from ditto $38^\circ 58'$ Wednesday, March 8. By a good Amplitude made $18^\circ 2'$ Variat.NW. Latitude per Observation $25^\circ 11'$ South. Merid. Dist. from Java Head $40^\circ 30'$ West. Longitude from ditto $42^\circ 33'$ Friday, March 10. By an Azim. and Amplitude made $19^\circ 00'$ Variat.NW. Latitude per Observation $26^\circ 18'$ South. Meridian Distance $42^\circ 42'$ West. Longitude $44^\circ 5'$ Monday, Monday, March 13. By a very good Amplitude $21^\circ 45'$ Variat. NW. Latitude per Observation $27^\circ 23'$ South. Meridian Distance $44^\circ 1'$ West. Longitude from Java $46^\circ 34'$ Friday, March 17. By a good Azimuth made $24^\circ 23'$ Variat. NW. Latitude per Account $30^\circ 25'$ South. Merid. Dist. from Java Head $51^\circ 29'$ West. Longitude ditto $54^\circ 52'$ Sunday, March 19. By a good Azimuth had $24^\circ 50'$ Variat. NW. Latitude per Observation $30^\circ 27'$ South. Meridian Distance $56^\circ 40'$ West. Longitude $59^\circ 21'$ Wednesday, March 22. By a good Azimuth had $24^\circ 15'$ Variat. NW. Latitude per Account $31^\circ 23'$ South. Merid. Dist. from Java Head $61^\circ 37'$ West. Longitude from ditto $66^\circ 03'$ Friday, March 24. By a good Amplitude had $23^\circ 51'$ Variat. NW. Latitude per Observation $32^\circ 47'$ South. Meridian Distance $63^\circ 00'$ West. Longitude $67^\circ 44'$ Saturday, April 1. By a good Amplitude made $20^\circ 16'$ Variat. NW. Latitude per Observation $34^\circ 58'$ South. Merid. Dist. from Java Head $73^\circ 36'$ West. Longitude from ditto $79^\circ 44'$ X x 2 Tuesday, Tuesday, April 4. By a good Azimuth and Amplitude $20^\circ 07'$ Variat. NW. Latitude per Observation $35^\circ 33'$ South. Merid. Dist. from Java Head $74^\circ 42'$ West. Longitude from ditto $81^\circ 24'$ West. Thursday, April 6. By a good Amplitude made $19^\circ 07'$ Variat. NW. Latitude per Observation $35^\circ 41'$ South. Merid. Dist. from Java Head $77^\circ 02'$ West. Longitude from ditto $87^\circ 12'$ West. Friday, April 7. By a very good Amplitude made $17^\circ 30'$ Variat. NW. Latitude per Observation $36^\circ 25'$ South. Meridian Distance from Java $77^\circ 56'$ West. Longitude from ditto $87^\circ 38'$ West. Monday, April 10. By a good Azim. & Amplitude made $16^\circ 09'$ Variat. NW. Latitude per Observation $38^\circ 18'$ South. Merid. Dist. from Java Head $77^\circ 24'$ West. Longitude from ditto $87^\circ 26'$ West. Thursday, April 13. By a good Azim. & Amplitude made $15^\circ 40'$ Variat. NW. Latitude per Observation $37^\circ 58'$ South. Merid. Dist. from Java Head $77^\circ 21'$ West. Longitude from ditto $85^\circ 15'$ West. Friday, April 14. By a very good Azim. & Amplitudes $15^\circ 45'$ Variat. NW. Latitude per Observation $37^\circ 04'$ South. Merid. Dist. from Java Head $76^\circ 54'$ West. Longitude from ditto $84^\circ 42'$ West. N. B. This Day I judged Cape Bonne Esperance to bear N. by W. from me, Distance $2^\circ 34'$. Sunday. Sunday, April 16. By a very good Azimuth made $16^\circ 14'$ Variat.NW. Latitude per Observation $36^\circ 15'$ South. Merid. Dist. from Java Head $77^\circ 59'$ Ditto from Cape Bonne Esperance $00^\circ 30'$ Longitude from Java Head $85^\circ 14'$ Tuesday, April 18. By a very good Amplitude made $15^\circ 45'$ Variat.NW. Latitude per Observation $35^\circ 33'$ South. Merid. Dist. from Java Head $79^\circ 05'$ Ditto from Cape Bonne Esperance $01^\circ 36'$ Longitude from Java Head $86^\circ 10'$ Friday, April 21. By a very good Azimuth made $14^\circ 40'$ Variation. Latitude per Observation $32^\circ 23'$ South. Merid. Dist. from Java Head $81^\circ 09'$ Ditto from Cape Bonne Esperance $03^\circ 40'$ Longitude from Java Head $87^\circ 09'$ Monday, April 24. By a good Amplitude made $12^\circ 39'$ Variat.NW. Latitude per Observation $27^\circ 01'$ South. Merid. Dist. from Java Head $84^\circ 52'$ Ditto from Cape Bonne Esperance $07^\circ 23'$ Longitude from Java Head $89^\circ 18'$ Saturday, April 29. By good Azimuths made $11^\circ 20'$ Variation. Latitude per Observation $21^\circ 45'$ South. Meridian Dist. from Java Head $89^\circ 08'$ Ditto from Cape Bonne Esperance $11^\circ 41'$ Longitude from Java Head $92^\circ 20'$ Friday, Friday, May 5. Latitude per Observation 16° 00' South. Meridian Dist. from Java Head 97° 43' Ditto from Cape Bonne Esperance 20° 16' West. Longitude from Java Head 99° 53' By an Ampl the Night before came in 8° 00' NW. At Noon Barn Point bore W. by N. ¼ N. Distance four Miles VII. An Account of an extraordinary Eruption of Mount Vesuvius in the Month of March, in the Year 1730, extracted from the Meteorological Diary of that Year at Naples, communicated by Nichol. Cyrillus, M.D. R.S.S. The Thermometer used in this Diary, was made by Mr. Hawksbee, in which the Freezing-Point is marked at 65 Degrees under the Point extreme Hot; but the Doctor observes, that at Naples Water will freeze when this Thermometer stands at 55 Degrees only: Which, he is of Opinion, seems to argue, that there is something else besides an intense Degree of Cold required for freezing Water; that the Air of Naples abounds in it, more than the Air of London; and that this may probably be of a saline Nature; because when we turn Water into Ice by the Help of Snow, it is necessary to mix Salt with it. March Ther. Winds. 8. 40° 0. S. 3° Cloudy Weather; strong South Wind. Vesuvius sent forth a great Smoak and Stream of Fire, with hollow Rumbling. March