8th Experiment.
The luminous spots, of spurious disks of the globules were of unequal diameters. The globule No. 1 had the largest disk, and the smaller ones the least; and the gradation of the sizes followed the order of the numbers.
(2.) This agrees with the spurious disks of celestial objects: the stars of the first, second, and third magnitude having a larger spurious disk than those that are of inferior magnitudes.
9th Experiment.
I found that there was a considerable difference in the colour of the spurious disks; one of them was of a beautiful purple colour, another was inclined to orange, a large one was straw coloured, a small one pale-ash coloured, and most of them were bluish-white.
(3.) With respect to colours, therefore, the terrestrial also agree with the celestial spurious disks.
10th Experiment.
I made two globules of different diameters, and placed them very near each other, so that their spurious disks might resemble those of a double star; this succeeded perfectly well. I viewed them with different powers.
With 177 the vacancy between them is 34 diameter of the large star.
With 232, it is 114 diameter.
With 303,8, it is 158 diameter.
With 432,3, it is 134.
(4.) This experiment proves that the spurious diameters
