10 Annals of the South African Museum. 



of the larger iron written by Mr. Tonkin, mentions "two smaller 

 (meteorites) taken in to Kokstad at the same time," as the larger 

 one. 



The one of these, which later came to Cape Town, was, at the written 

 request of Mr. Watermeyer, given to Prof. P. D. Hahn, South African 

 College, who ultimately forwarded it to the Hof museum, Vienna. 

 This iron, weighing 43 kg., was recorded first by Brezinain 1887, who 

 gives Kokstad as the locality, 1884 as the date of its discovery, and 

 mentions especially the jaw-bone-like shape. This he regards as 

 representing the final stage in the explosion of a ring-shaped mass, 

 and compares it to the Signet iron ring (Tucson Ainsa ring, Mucha- 

 chos) which might, on bursting, have yielded two pieces, one of 

 which would have had exactly the shape of the Kokstad iron.* In 

 the following year Brezina describes a hemispherical cavity, 7 cm. in 

 diameter, visible on the surface of the iron, as due probably to the 

 falling out of a huge troilite nodule. t 



Later, in 1894, Brezina published a reproduction of the meteorite, 

 and mentioned the enormous abundance of minute troilite grains.]: 

 In 1895 he classed the Kokstad iron among the " Octahedral Irons 

 with lamellae of medium width," and briefly described the Widman- 

 statten figures : " Lamellae rarely closely joined together (geschart), 

 with rounded ends (wulstig) ; kamacite hatched (schraffirt) with 

 orientated sheen ; taenite moderately developed ; fields numerous 

 and small, filled with dark grey plessite or half-shaded central 

 skeletons." § 



In 1891 Dr. Weinschenk, of Munich, and I examined portions of 

 the oxidised crust, and found it to contain chlorine and silicate 

 grains, among which, as usual, a colourless quartz-like substance 

 predominated. The material was not suitable for further examina- 

 tion. || 



The South African Museum specimen, which originally weighed 

 657 lbs. (298 kg.), is known to me only from photographs and from 

 a piece weighing ^ kg., which Dr. Corstorphine sent me for examina- 

 tion. This piece I have had cut into eight slices. 



* Neue Meteoriten des k.k. naturhistorischeu Hofmuseums. Verb, der k.k. 

 geolog. Reichsanstalt 1887, 289. 



t Annalen des k.k. naturhistorischeu Hofmuseums, 1888, iii. Not. 42. 



I Die Gestaltung der Meteoriten. Schriften des Vereius zur Verbreitung natur- 

 wiss. Kenntnisse in Wien, 1894, xxxiv. 269-270. 



g Die Meteoritensammlung des k.k. naturhistorischeu Hofmuseums am 

 1 Mai, 1895. Ann. des k.k. naturhist. Hofmuseums, 1896, x. 284. 



I! Meteoreisen-Studien. lb. 1891, vi. 159. 



