SCIENTIFIC SUMMAEY. 
231 
hoTrever, that in minor points Maedler’s map camiot be trusted "when sus- 
picions of change are in question, as it omits some craters which are given 
in maps published previously. Thus Sclrroeters delineation of the mountain 
Ka^stnei' is more correct than Maedler’s, and the craters in the Sinus 
given by Lohrmann are not found in the later constructed map. 
To those cases !Mr. Webb adds the following ; — In the mountain Helicon 
there is a crater lying close to the ring on the S.E. side, and another very 
minute one on the east waU. Another is in the Mare Imbrium in the direction 
from Helicon to Archimedes, and is insulated in the open plain. One, of an 
elliptical form, which contains a distinct shadow, is found between Kirch and 
a similar crater in the N.W., and there are other minute craters in the Mare 
Imbrium not given by Maedler. There is a small crater on the north end of 
the crater Delisle. To the S.E. of Dioiohantus there is a conspicuous but 
small crater. In the mountain Copernicus the S. and S.W. slope is thickly 
studded with very minute craters, which form a continuation of the similar 
district lying between Copernicus and Eratosthenes, and which Mr. Webb 
thinks has assi^med its present aspect during the present century. In the 
remarkable convex interior of the mountain Mersenius, in which Maedler 
'states that a central mountain is totally absent, Mr. Webb detected a minute 
crater with a small telescope as far back as 1836, and he has since found that 
it was noticed even earlier by Lohrmann. Craters which were seen by 
Schroeter in 1797 in the interior of Gassendi, and by Mr. Webb in 1863, 
are not mentioned by Maedler. It will be seen from the foregoing how diffi- 
cult it is to discriminate between errors of drawing and real physical change 
! on the lunar surface. 
Meteors on the Sun’s Surface. — It will be remembered that a few years ago, 
’ wffiilst ffiewmg the sun through a telescope, Mr. Carrington perceived a 
\ meteor passing across the disc. This was at his observatory at Kedhill ; but 
' the appearance was independently seen and described by Mr. Hodgson, at 
London. A similar phenomenon was noticed by Mr. Brodie, of Uckfield, at 
10'30 a. m. of October 2. The length of its j)ath in the field of view was 
about one minute of arc, the breadth of the head about four or five seconds 
I of arc, and the duration of its visibility about three-tenths of a second. It 
first appeared at the lower part of the field of view, and passed nearly ver- 
tically towards the centre. It had a slightly curved tad, with two very con- 
; siderable “ serrations ” on its eastern edge. Mr. Brodie describes it as a very 
i* brilliant body, far surpassing in lustre that of the sun itself. As the telescope 
I has an object-glass of 8i inches aperture, and the eye-piece specially adapted 
C for looking at the sun, and found to be in good order, there can be no doubt 
I in respect to the reality of the aj)pearance. 
I Bright Band round the Moon’s Edge in Solar Eclipses. — Professor Challis 
recurs to this subject in the last number of the Astronomical Society’s 
k notices. He now admits with Professor Airy that this bright band cannot be 
I explained by refraction through a lunar atmosphere. He has examined three 
I of the photographs taken of the last solar eclipse by Professor Alexander, and 
j finds that, when they are looked at too closely or too distant, for distinct 
I vision, a white band not only appears round the edge of the moon, in- 
creasing in intensity towards the cusps, but also in the interior of the sun’s 
border. On viewing them with distinct vision, the bands, however, disap- 
