14 Field Museum of Natural History — Geology, Vol. V. 



writer has ever noted in a mesosiderite. Material for a chemical analysis 

 of the specimen was obtained by boring to a depth of 2 cm. in the mass 

 with a 5 cm. drill. This gave about 1.9 grams of a black, magnetic 

 powder which was, except for a little gelatinous silica, completely soluble 

 in hydrochloric acid. Analysis by H. W. Nichols gave: 



Fe 70 . 72 



Ni o . 23 



Co trace 



Cu 12.35 



Ag 0.17 



Pb ; 0.78 



Zn o . 94 



Mn trace 



S 13 29 



P trace 



C 0.35 



Si O2 0.27 



99.10 



A1 2 3 , Ca 0, Mg 0, and alkalies were present in traces. The analysis 

 shows the mass to be chiefly a sulphide of iron and copper with probably 

 much of the iron reduced to the metallic form. It cannot be considered 

 of meteoric origin. The small percentage of nickel may have given a 

 qualitative test which led the original finder to assume a meteoric nature. 



There seems to be little doubt that the material is of artificial origin, 

 the result of some smelting operation. The piece may have been broken 

 from some hearth accretion. In any case the evidence seems to warrant 

 dropping Macquarie River from the list of accepted meteorites. 



SOUTH BEND 



The determination of the specific gravity of this meteorite by the 

 writer in his original description* was called in question by Dr. Peter 

 Tschirwinsky in a note to the writer in February, 1908. Dr. Tschirwin- 

 sky suggested that the value (4.28) obtained seemed low for a meteorite 

 containing so much metal. Accordingly a new determination of the 

 specific gravity was made by the writer, with the result that a value of 

 4.91 was obtained. Evidently some error was made by the writer in his 

 first determination, and Dr. Tschirwinsky 's kindness in pointing out 

 such a probability is gratefully acknowledged. Using the new value to 

 obtain a determination of the relative proportions by weight of the 

 nickel-iron and chrysolite in the meteorite, the result is : 



Nickel-iron 56.2% Chrysolite 43.8% 



This ratio should be substituted for that previously given. 



* Pubs. Field Col. Mus., 1906, Geol. Ser., Vol. 3, p. 20. 



