344 
PEOEESSOE PHILLIPS ON SOME PAETS 
PLATE XVII. 
The twin craters of Aristarchus and Herodotus, with the rill proceeding from the 
latter. Several small craters on the side of the rill and about the seeming delta are 
omitted. The crater edge of Aristarchus appears to me a double crest, with a narrow 
deep chasm between the ridges. It. The rill from Herodotus. E.W. Borders of the 
seeming delta, r. Smaller rill. 
The memoir was accompanied by several other drawings, which it is the intention of 
the author to present to the Royal Society for reference. The following is a List of 
these illustrations. Nos. 1, 2, 4, and 5 are referred to in the Memoir, pages 333 and 334. 
No. 1. Sketch of Gassendi, taken in 1852, at Birr Castle, with the great telescope of 
Lord Rosse (morning). 
No. 2. Sketch of Gassendi, taken in 1852, at York, with an achromatic by Cooke, 
of 2 ‘4 inches diameter (morning). 
No. 4. Sketch of Gassendi, taken in 1862, at Oxford, with an achromatic by Cooke, 
of 6 inches diameter (evening). 
No. 5. Working Plan of Gassendi, and Scale. 
No. 6. Freehand sketches to illustrate the mode of working for general effect. 
Oxford, 1864. 
No. 10. Posidonius, early morning, 1863. Unfinished. 
No. 11. Posidonius, nearer to midday, 1863. Unfinished. 
SUPPLEMENT. 
Eeceived May 23, 1868. 
Since the preceding remarks were presented to the Royal Society, I have had the oppor- 
tunity of reading the valuable memoir of J. F. J. Schmidt, the Director of the Observa- 
tory at Athens, entitled “ Uber Rillen auf dem Monde,” 1866, and of comparing the 
maps of some parts of the moon which accompany his essay with my sketches. I 
rejoice to see how large an increase to the known number of rills has been made by this 
experienced observer, aided by the favourable “ clearness of the Athenian climate.” 
In my sketch of Aristarchus (Plate XVII.), the principal purpose was to show the 
sharp-edged double western crest and the internal broad moulding. In the character of 
the double crater-wall Schmidt’s Map agrees with my drawing, and extends this feature 
to the eastern side. 
There is less agreement in the shape of the interior surface, on which I have bestowed 
much attention, first with the 3-foot mirror of Lord Rosse (power 200), next with my long 
achromatic at York, and finally at Oxford with my 6-inch Cooke. The country lying 
