440 T. T. QUIRKE 



The silicate portion yielded : 



Percentage 



SiOa 44-49 



TiOa . . O . lO 



AI2O3 ......... 2.46 



CrzOs 0.64 



Fe203 , . . 4.34 



P.Os None 



MnO 0.19 



FeO 16.23 



CaO . . . 2.69 



MgO 28.32 



Na.O 0.85 



K2O 0.165 



100.475 



These analyses were made from fragments apparently repre- 

 sentative of the matrix of the meteorite, but not representative 

 of the vein material. From the absence of sulphur and copper 

 in the analysis it appears that the vein material is generally dif- 

 ferent from the rest of the stone. 



On November 9, 10, and 11, 1919, the following data and 

 evidence were collected at the places noted. 



At Mandan, 70 miles east and about 10 miles north of the 

 locality of the fall, several people saw the meteorite. It happened 

 that there were two troop-trains in the yards at the time and any 

 noise the meteorite made was not noticed during the celebration. 



At Dickinson, 30 miles northwest of the locality, the meteorite 

 appeared as a bright light which went out suddenly, accompanied 

 by a rushing, roaring sound which seemed to shake the air. 



A person interviewed in Richardton was in New Leipzig, about 

 20 miles southeast of the locality, at the time the meteorite fell. 

 He had just gone to bed when he was startled by a brilliant light, 

 which he took momentarily for the headlight of a locomotive; 

 however, he went to the window and saw a meteorite passing to 

 the west of the town, going apparently in a northwest direction 

 and falling at a low angle. The witness recalled that there was a 

 roaring sound like that of an airship for about two miniites, fol- 

 lowed by a violent explosion ; it was a fearful and terrifying noise, 



