﻿1875.] 
  the 
  Heat 
  of 
  Sunshine 
  at 
  London, 
  579 
  

  

  Table 
  I. 
  

  

  Individual 
  Determinates 
  of 
  the 
  Burnt-out 
  Spaces. 
  

  

  Date. 
  

  

  First 
  

  

  Second. 
  

  

  Mean. 
  

  

  measurement. 
  

  

  measurement. 
  

  

  Dec. 
  1854 
  to 
  June 
  1855.. 
  

  

  8-045 
  

  

  7-570 
  

  

  7-808 
  

  

  June 
  1855 
  to 
  Dec. 
  1855. 
  . 
  

  

  3-580 
  

  

  3-320 
  

  

  3-450 
  

  

  Dec. 
  1855 
  to 
  June 
  1856. 
  . 
  

  

  1-285 
  

  

  0-905 
  

  

  1-095 
  

  

  June 
  1856 
  to 
  Dec. 
  1856. 
  . 
  

  

  1-330 
  

  

  1-115 
  

  

  1-223 
  

  

  Dec. 
  1856 
  to 
  June 
  1857 
  . 
  . 
  

  

  1-085 
  

  

  1-100 
  

  

  1-093 
  

  

  June 
  1857 
  to 
  Dec. 
  1857. 
  . 
  

  

  0-360 
  

  

  0-529 
  

  

  0-445 
  

  

  Dec. 
  1857 
  to 
  June 
  1858 
  . 
  . 
  

  

  19-591 
  

  

  19-376 
  

  

  19-484 
  

  

  June 
  1858 
  to 
  Dec. 
  1858 
  . 
  . 
  

  

  23-210 
  

  

  22-697 
  

  

  22-954 
  

  

  Dec. 
  1858 
  to 
  June 
  1859. 
  . 
  

  

  20-795 
  

  

  20-510 
  

  

  20-653 
  

  

  June 
  1859 
  to 
  Dec. 
  1859 
  . 
  . 
  

  

  31-296 
  

  

  30-440 
  

  

  30-868 
  

  

  Dec. 
  1859 
  to 
  June 
  1860. 
  . 
  

  

  13-115 
  

  

  12-865 
  

  

  12-990 
  

  

  June 
  1860 
  to 
  Dec. 
  1860. 
  . 
  

  

  19-340 
  

  

  19-525 
  

  

  19-433 
  

  

  Dec. 
  1860 
  to 
  June 
  1861. 
  . 
  

  

  10-580 
  

  

  10-205 
  

  

  10-393 
  

  

  June 
  1861 
  to 
  Dec. 
  1861. 
  . 
  

  

  16-920 
  

  

  17-030 
  

  

  16-975 
  

  

  Dec. 
  1861 
  to 
  June 
  1862. 
  . 
  

  

  8-578 
  

  

  8-670 
  

  

  8-624 
  

  

  June 
  1862 
  to 
  Dec. 
  1862. 
  . 
  

  

  20-600 
  

  

  21-170 
  

  

  20-885 
  

  

  Dec. 
  1862 
  to 
  June 
  1863. 
  . 
  

  

  5-780 
  

  

  6-040 
  

  

  5-910 
  

  

  June 
  1863 
  to 
  Dec. 
  1863. 
  . 
  

  

  24-310 
  

  

  24-100 
  

  

  24-205 
  

  

  Dec. 
  1863 
  to 
  June 
  1864. 
  . 
  

  

  3-990 
  

  

  4-250 
  

  

  4-120 
  

  

  June 
  1864 
  to 
  Dec. 
  1864. 
  . 
  

  

  15-290 
  

  

  14-985 
  

  

  15-138 
  

  

  Dec 
  1864 
  to 
  June 
  1865.. 
  

  

  10-400 
  

  

  9-741 
  

  

  10-071 
  

  

  June 
  1865 
  to 
  Dec. 
  1865. 
  . 
  

  

  18-180 
  

  

  17-900 
  

  

  18-040 
  

  

  Dec. 
  1865 
  to 
  June 
  1866. 
  . 
  

  

  6-600 
  

  

  . 
  6-970 
  

  

  6-785 
  

  

  June 
  1866 
  to 
  Dec. 
  1866.. 
  

  

  19-225 
  

  

  18-785 
  

  

  19-005 
  

  

  Dec. 
  1866 
  to 
  June 
  1867. 
  . 
  

  

  9-820 
  

  

  9-750 
  

  

  9-785 
  

  

  June 
  1867 
  to 
  Dec. 
  1867.. 
  

  

  23-425 
  ■ 
  

  

  23-495 
  

  

  23-460 
  

  

  Dec. 
  1867 
  to 
  June 
  1868.. 
  

  

  15-430 
  

  

  15-440 
  

  

  15-435 
  

  

  June 
  1868 
  to 
  Dec. 
  1868 
  . 
  . 
  

  

  13-970 
  

  

  13-540 
  

  

  13-755 
  

  

  Dec. 
  1868 
  to 
  June 
  1869. 
  . 
  

  

  6-820 
  

  

  6-720 
  

  

  6-770 
  

  

  June 
  1869 
  to 
  Dec. 
  1869. 
  . 
  

  

  24-105 
  

  

  24-780 
  

  

  24-443 
  

  

  Dec. 
  1869 
  to 
  June 
  1870. 
  . 
  

  

  9-750 
  

  

  9-750 
  

  

  9-750 
  

  

  June 
  1870 
  to 
  Dec. 
  1870. 
  . 
  

  

  22-170 
  

  

  21-830 
  

  

  22-000 
  

  

  Dec. 
  1870 
  to 
  June 
  1871 
  . 
  . 
  

  

  15-700 
  

  

  - 
  15-660 
  

  

  15-680 
  

  

  June 
  1871 
  to 
  Dec. 
  1871 
  

  

  16-880 
  

  

  16-690 
  

  

  16-785 
  

  

  Dec. 
  1871 
  to 
  June 
  1872.. 
  

  

  5-140 
  

  

  5-200 
  

  

  5-170 
  

  

  June 
  1872 
  to 
  Dec. 
  1872. 
  . 
  

  

  14-550 
  

  

  14-460 
  

  

  14-505 
  

  

  Dec. 
  1872 
  to 
  June 
  1873. 
  . 
  

  

  3-545 
  

  

  3-760 
  

  

  3-653 
  

  

  June 
  1873 
  to 
  Dec. 
  1873. 
  . 
  

  

  25-470 
  

  

  25-605 
  

  

  25-538 
  

  

  Dec. 
  1873 
  to 
  June 
  1874. 
  . 
  

  

  9-190 
  

  

  8-620 
  

  

  8-905 
  

  

  June 
  1874 
  to 
  Dec. 
  1874.. 
  

  

  20-745 
  

  

  20-400 
  

  

  20-573 
  

  

  Before 
  proceeding 
  further, 
  it 
  will 
  be 
  well 
  to 
  state 
  that 
  the 
  first 
  six 
  

   results 
  of 
  the 
  table 
  were 
  obtained 
  by 
  means 
  of 
  a 
  water 
  lens, 
  while 
  those 
  

   that 
  follow 
  were 
  obtained 
  by 
  a 
  glass 
  lens. 
  The 
  first 
  six 
  are 
  not 
  there- 
  

   fore 
  comparable 
  with 
  those 
  that 
  follow. 
  

  

  