64 N. 8S. Maskelyne on Aerolitics. 
Determination of the amount of light transmitted by one plate 
of polished orange colored glass, 7;th inch thick: 
No. 1, | No. 2. | No. 3. 
Flame free. | Orange glass. i Flame free. |Orange glass. | Plame free. | Orange glass. 
23°05 15°50 22-10 15°50 22°2 15°40 
22°60 15°80 22°20 15°75 22°2 15°65 
22°60 15°40 22-40 15°40 21°15 15°10 
22°64 15°30 22°60 15-60 21:8 15°00 
22°15 15°65 21-90 15°50 21:2 14:3 
22°35 15°50 
Amount of light | 
transmitted, 47°45 48°74 48°42 per cent. 
Determination of the amount of light transmitted by a plate 
of deeply colored red glass, ;',th of an inch thick: 
Flame free. Red glass. | Flame free. | Red glass. {| Flame free. | Red glass. 
21°56 18 21°10 6°7 20°9 65 
va bs 6° 21°15 6°6 20°2 6-7 
22° 73 21°40 6°9 7-0 
92- 6°7 6°8 6-2 
| 7. 66 | 
Light transmitted, 10-03 || 10°05 | 10°36 per cent. 
Peace Dale, R. I, May 7th, 1863. 
Arr. X.—On Aerolitics, and the fall of Stones at Butsura, India, 
May, 186 i a 
1; by N.S. MasKkeLyne. 
: 
sufficient importance to justify our giv 
I therefore propose for it the denomination with which this artic 
is headed. ny reasons conspire to render this study of ‘‘aero- 
litics”” one of increasing interest, and to make it highly desirable 
est attaching to a collection of them arises fact tha 
while they ig Se ee Lf 1. d = ile y withal, both 
_? Extracted from an article entitled Mineralogical Notes, by Professor Masia.xss 
i von Lane, (of the British Museum) in the L. E. & D. Phil. Mags 
oes 
