(iv) 



CONTENTS. 



LATITUDE OF THE OBSERVATORY &quot; ~ 



LONGITUDE OF THE OBSERVATORY 



MODE OF OBSERVING IN DIFFERENTIAL MEASURES ------- 



EXPLANATION OF THE PRINTED EQUATORIAL OBSERVATIONS 



Equatorial intervals of the micrometer system 



Description of i/te Mciidian circle and its adjustments 



EXPLANATION OF THE PRINTED MERIDIAN CIRCLE OBSERVATIONS 



Mean places of certain of the pre-selected stars ----- - Iv-lvi 



Mode of deducing the horizontal and vertical diameters of Mars and Venus from the differential measures - .,&quot;.- 1 



Mean apparent errors of the Nautical Almanac diameter of Mars - 1 



Menu apparent error of the Nautical Almanac vertical diameter of Venus l^u 



Reference of the observations to Dr. B. A. GOULD, jr l v &quot; 



THE SOLAR PARALLAX 



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



2. GENERAL STATEMENT OF THE PKOBLEM ----- ..---- Ixvui 



3. METHOD PURSUED ------------- -- Ixxu 



4. EPHEMERIDES AND AUXILIARY TABLES ------------- Ixxvu 



5. COMPARISON-STARS- ---------------- xcvu 



6. OBSERVATIONS ----------------- cxhv 



7. OBSERVATIONS COMPARED WITH EPHEMERIS - - - - - - - - - - - clxxxvi 



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



9. EQUATIONS OF CONDITION --------------- ccxui 



10. WEIGHTS AND MEAN ERRORS ..-.---------- ccxlvi 



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



$ 12. PRELIMINARY SOLUTIONS ccxlix 



13. FINAL SOLUTIONS cclxxv 



14. DIAMETERS cclxxix 



15. RESULTS - - . cclxxxiv 



SANTIAGO OBSERVATIONS 



Micrometrical observations of Mars and pre-selected stars near the opposition of 1S49- 50 1-84 



Micrometrical observations of Mars and pre-selected stars near the opposition of 1851- 52 85213 



Micrometrical observations of Venus and pre-selected stars near the inferior conjunction of 1850- 51 216-280 



Micrometrical observations of Venus and pre-selected stars near the inferior conjunction of 1852 - - 281305 



Meridian circle observations of Mars and certain stars near the opposition of 1851 52 - 309318 



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 Nautical Almanac 335-33(5 



Deduced diameters of Mars, 1851- 52, compared with the Nautical Almanac ------ 337338 



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 1849- 5() 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 



Right-ascensions of Mars (by transits) near the opposition of 1849- 5() 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., hjer Majesty s astronomer at ihe Cape ... 463-465 



Value of a revolution of the micrometer-screw 466 



Adjustments of the Equatorial --------_..__.. 466 



Particulars relating to the observations .&quot; 4G7 



Barometers r &quot; .... 468-469 



Rate and error of the clock 479 



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



