——e 
A CATALOGUE OF OBSERVATIONS OF LUMINOUS METEORS. 151 
No. 3. Meteorite from Coahuila, Mexico. 
Corresponding to 
Bends op easi-ss 0s) AOS Nickeliferous iron 98°45 
Gabalt...0 4 ans 35 Schreibersite . + 1°55 
Ne ion hice omy Hoke 
Copper - - - (a trace) 
Phosphorus . . "24 
ed 
99°59 100-00 
No. 4. Meteorite from Tucson, Mexico. 
Wronie eo, a ep OB Oe Nickeliferous iron 93°81 
INiekebte esa) es OD Chromic iron. . “41 
Oopaltss sca ‘61 Schreibersite . . ‘84 
Copper . =: - 03 Olivine. . . - 5°06 
Phosphorus . - "12 
Chromic oxide . Al 
Magnesia. . - 2°04 
NIGH fs coy © es aoe OF 
Alumina . . _.. (a trace) 
100712 100712 
No. 5. From Chihuahua, Mexico. Not analysed. 
The other details as to the structure, form, physical characters, &c., of 
these meteorites are not susceptible of abridgement. But they all present 
evident marks of fusion or igneous action; while the author’s inference as to 
the fragmentary nature seems somewhat doubtful. 
« Experiments on Light, referring to the apparent magnitudes 
of Luminous Meteors.” 
(Prof. L. Smith’s Memoir, p. 30.) 
In the author's experiments three solid bodies in a state of vigorous in- 
candescence were used: Ist, charcoal points transmitting electricity ; 2nd, 
lime heated by the oxy-hydrogen blowpipe ; $rd, steel in a state of incan- 
descence in a stream of oxygen gas. They were observed on a clear night 
at different distances; and the body of light (without the bordering rays) 
compared with the disk of the moon, then nearly full, at 45° above the hori- 
zon, The results are given in the following table :— 
Apparent Apparent Apparent 
Actual 
: diameter diameter diameter 
diameter. | a¢ 100 yards.| at + mile. at 3 mile. 
Carbon points .....s.sseceeee *3 inch idiam.of )| 3times ) | 3}times D 
Lime light.........sceeeeseseee ‘4 inch 3diam.of ) | 2 do. 2 do. 
Incandescent steel globule *2 inch idiam.of )!| 1 do. 1 do. 
If then, the author argues, the apparent diameter of a luminous meteor at 
a given distance is to be accepted as a guide for calculating the real size of 
these bodies, they would be (according to the table given by Prof. Olmsted 
(Am. Journ. of Science, vol. xxvi. p. 155) for estimating the diameters of 
meteors in comparison with the moon), 
Charcoal points ...... wessseeeee 80 feet diameter. 
Lime light ..0.......00.0-+-0-- 50 5 < 
Incandescent steel globule ...... 25 » gs 
