LVI. Observations on Meteorolites or Aerolites, considered Geo- 

 graphicallyj Statistically, and Cosmically, accompanied by a 

 complete Catalogue. By R. P. Greg. 

 [Concluded from p. 342.] 



THERE is no occasion, in continuation, to enter into details 

 concerning the phsenomena attending the fall of meteorites 

 and fire-balls, &c., or give a list of the analyses which have from 

 time to time been made of various meteoric irons and stones. 

 Suffice it to say, that no new chemical element has yet been dis- 

 covered in these bodies, though several new mineral compounds 

 have been observed. Most, indeed nearly all, the simple chemical 

 elements have been detected in them. 



Some consist of pure iron ; others of iron alloyed with nickel, 

 perhaps also accompanied with small quantities of carbon, chro- 

 mium, cobalt, arsenic and phosphorus ; and some few are me- 

 chanically combined with crystallized olivine ; the majority have, 

 however, a common or normal character, both internally and 

 externally. They have been variously classified; as by Prof. 

 Shepard in the following way, treating them as it were minera- 

 logically : — 



Class I. — Metallic. 

 Order 1. 



Tv/r n ui fSec. I. Pure. 



Malleable, I m^ -i ^ iv 



homogeneousi Sec. II. AUoyed / ^'°^^'y crystalline. 

 ° L [ Coarsely crystalhne. 



Order 2. 

 Malleable. / Amygdalo-peridotic. 



, . < Amyerdalo-pyritic. 



heteroi'eneous I r* •<. i I • i 



=> [^Pynto-plumbagmous. * ^ 



- Orders. - - 



fPure. 

 ' ' \ Alloyed. 



Class II. — Stony. 



Brittle : . , 

 Order 1 



Sec. I. Peridotic/^^^'^^-g^^^f^- 

 \ r me-gramed. 



Trachytic. . . . -^ Sec. II. Pyroxenic. 



Sec. III. Chladnitic. 



^Sec. IV. Carbonaceous. 



Order 2. 



Trannean l^^^' ^- Homogeneous, 



irappean. . . . |g^^ jj Porphyritic. 



Order 3. Pumice-like. 



Probably, and partly in connexion with this similarity with 

 the chemical elements and even minerals of our own planet, has 

 been developed the theory of the /iow-e.2;^r«-terrestrial origin of 



