Oct., 1907. Meteorite Studies II — Farrington. 113 



dimensions of the mass would have been if the two parts were joined 

 along the fractured surfaces, the two full-sized models of these masses 

 in possession of the Museum were joined in this way. The resulting 

 form is shown in the accompanying plate. (Plate XXXI.) It is seen 

 to be broad and tabular with irregular outline. Along the line where 

 disruption took place there was an evident constriction. The corre- 

 spondence between the broken surfaces is such as to leave little 

 doubt that they were once joined. The dimensions of the mass so 

 formed are: Length 12 feet (3.6 meters) and width 7 feet (2.1 

 meters). The weight of this mass would have totaled about 21 tons 

 (20,881 kgs.). It would be of interest to know which surfaces of the 

 two masses lay uppermost when found, but no record seems to have 

 been made of this point. There is a marked difference in the pittings 

 on the two broad surfaces and they correspond on the two masses 

 when joined. Thus pittings on the side shown in the accompanying 

 plate are deeper and narrower than those on the opposite side. The 

 indications are therefore that the side shown in the accompanying 

 plate was the front side in falling. 



As the writer is not aware that any photographs of the two original 

 masses have ever been published, the accompanying cuts (Plates 

 XXXII-XXXIII) from photographs made by him in 1896 are pre- 

 sented. These show the masses as they are installed in the National 

 School of Mines in the City of Mexico. With them, as installed, are 

 placed the Concepcion (Adargas) and Zacatecas meteorites. The 

 large Chupaderos and the Concepcion masses are installed at one side 

 of the entrance of the School of Mines (Plate XXXII) and the smaller 

 Chupaderos and the Zacatecas masses at the other side of the entrance 

 (Plate XXXIII). In Plate XXXIV is shown the Morito (San 

 Gregorio) mass which is likewise installed at the School of Mines, and 

 of which a photograph was made by the writer at the same time. 

 This is a beautifully oriented meteorite and, as will be seen, has been 

 mounted in the position it assumed when falling. 



IRON CREEK. 



A cast of this meteorite recently received by the Museum (Museum 

 No. Me 763) through the kindness of the Geological Survey of Canada 

 affords an opportunity for the study of some features which have not 

 previously received description. The meteorite is remarkable for 

 its orientation, the characters of front and rear sides being shown very 

 plainly. In perfection of form in this respect it equals the Cabin 

 Creek meteorite, which in general shape it resembles. In previous de- 



