(iv) 



CONTENTS. 



LATITUDE or THE OBSERVATORY ... ... xlix-1 



LONGITUDE OF THE OBSERVATORY .... 



MODE Of OBSERVING IN DIFFERENTIAL MEASURES - 



EXPLANATION OF THE PRINTED EQUATORIAL OBSERVATIONS ------- 



Equatorial intervals of the micrometer system -- lu 



Description of ike Metiilian circle anil its adjustments ---. liii-liv 



EXPLANATION OF THE PRINTED MERIDIAN CIRCLE OBSERVATIONS liv 



Mean places of certain of the pre- selected stars ....-.------- lv-]vi 



Mode of deducing the horizontal and vertical diameters of Mars and Venw from the differential tneasurea .... Ivi 



Mean apparent errors of the Nautical Almanac diameter of Mars ..--- Ivi: 



Mean apparent error of the Nautical Almanac vertical diameter of Venus ....-.-- Ivii 



Eeference of the observations to Dr. B. A. GOULD, jr ............ ^ Ivii 



THE SOLAR PARALLAX 



I. INTRODUCTORY AND HISTORICAL -..-..-------- Ixi 



2. GENERAL STATEMENT OF THE PROBLEM Ixviii 



$ 3. METHOD PURSUED -- Ixxii 



$ 4. EPHEMERIDES AND AUXILIARY TABLES ------------- IxXVli 



{ 5. COMPARISON-STARS .__.-.....-- xcvii 



J 6. OBSERVATIONS ----... ..--- cxliv 



J 7. OBSERVATIONS COMPARED WITH EPHEMERIR ------------ clxxxvi 



$ 8. SOLAR PARALLAX FROM CORRESPONDENT OBSERVATIONS ---------- ccix 



$ 9. EQUATIONS OF CONDITION -...._._..----- ccxiii 



$ 10. WEIGHTS AND MEAN ERRORS ccxlvi 



$11. FUNDAMENTAL EQUATIONS -......--... cclix 



$ 12. PRELIMINARY SOLUTIONS ccxlix 



$ 13. FINAL SOLUTIONS --..__.._----_.. cclxxv 



$ 14. DIAMETERS cclx.xix 



15. RESULTS cclxxxiv 



SANTIAGO OBSERVATIONS 



Micrometrical observations of Mars and pre-selected stars near the opposition of 1349-'50 1-84 



Micrometrical observations of Mars and pre-selected stars near the opposition of 1851-'52 85-213 



Microtnetrical observations of Venus and pre-selected stars near the inferior conjunction of ]850-'51 216-280 



Micrometrical observations of Venus and pre-selected stars near the inferior conjunction of 1852 - - 281-305 



Meridian circle observations of Mars and certain stars near the opposition of 1851-'52 ... - 309-318 



Meridian circle observations of Venus and certain stars near the inferior conjunction of 1850-'51 - - 319-326 



Meridian circle observations of Venus and certain stars near the inferior conjunction of 1852 - - - 327-332 



Deduced diameters of Mars, 1849-'50, compared with the Nnutical Almanac 335-330 



Deduced diameters of Mars, 1851-'52, compared with the Nautical Almanac 337-338 



Deduced and measured diameters of Venus, 1850-'51, compared with the Nautical Almanac - - - 339-340 



Deduced and measured diameters of Venus, 1852, compared with the Nautical Almanac - - - - 341 



WASHINGTON OBSERVATIONS 



Letter from Lieutenant M. F. Maury, LL.D., &c., Superintendent 345 



Description of the equatorial, and explanation of the observations, by J. Ferguson, esq., ass't astronomer 345-347 



Micrometrical observations of Mars and pre-selected stars near the opposition of J849-'50 351-378 



Micrometrical observations of Mars and pre-selected stars near the opposition of 1851-'52 379-385 



Micrometrical observations of Venus and pre-selected stars near the inferior conjunction of 1850-'51 389-405 



Micrometrical observations of Venus and pre-selected stars near the inferior conjunction of 1852 406-414 



CAMBRIDGE (MASS.) OBSERVATIONS 



Introductory remarks, by Professor Wm. C. Bond, director of the observatory 417 



Hight-ascensions of Mars (by transits) near the opposition of 1849-'50 418-447 



Right-ascensions of Mars, by micrometer measurements, near the opposition of 1849-'50 .... 448-452 



Declinations of Mars, by micrometer measurements, near the opposition of 1849-'50 .... 453-460 



CAPE OF GOOD HOPE OBSERVATIONS 



Editorial notice 463 



Description of the Equatorial by Thos. Maclear, esq., her Majesty's astronomer at the Cape - - 463-465 



Value of a revolution of the micrometer-screw - 466 



Adjustments of the Equatorial - 466 



Particulars relating to the observations 467 



Barometers r 468-469 



Rate and error of the clock 470 



Micrometrical observations of Mars and pre-selected stars near the opposition of 1849-'50 - - 471-492 



