Note 2 — Front matter
Reading edition
The following table shows the position occupied by the years 1851 and 1860 in this report, as compared with the year 1848 (maximum next preceding 1851), 1856 (minimum next following 1851) and 1867, minimum next following 1860:—
Days of observation Days without spots New groups observed
1848 278 0 930
1851 308 0 141
1856 321 193 34
1860 332 0 211
1867 312 195 25
A comparison of the three tables given in these notes and the text will afford some idea of the irregularities existing in the various waves of sun-spots.