W. M. Foote— Shower of Meteoric Stones, Arizona. 445 



the meteorite. One 450-gram Holbrook fragment with deeply 

 furrowed brustseite similarly shows 1 to 2 mm fragments of 

 unaltered stone enclosed in the back crust, the semi-fused area 

 being 1 to 3 mm thick. 



A few well-marked brustseite stones (fig. 3) show fractures 

 near the base; none at the head of the stone. This would 

 indicate that the pressure of the air stream on the rear 

 edge is a factor in disruption, as well as the expansion 

 due to heat. In some instances the radial fusion flow 

 is shown on the secondary crust of fragments, notably in tigs. 

 8 and 9. Here the stone was apparently reversed in its flight 



Fig. 8. Fig. 9. 



Fig. 8. Front of stone, showing radial fusion flow on primary crust. 

 Fig. 9. Back of same stone, showing flow on secondary crust after rever- 

 sal of position in flight, x 0'9 diameters. 



after an early explosion, and a well-marked radial flow was left 

 upon the new brustseite. 



In the examination of a large number of stones, the thick 

 and minutely blebby character of the otherwise even crust on 

 one face would indicate the back of the stone, whereas the 

 fusion flow on the reverse, or front, might be but faintly marked, 

 or even absent. The front is often brownish, the back being 

 usually deep black. 



In rai'e cases the pits clearly result from the burning or frac- 

 turing out of pyrrhotite nodules, as illustrated in fig. 10. At 

 the lower end of the pit is a piece of the freshly fractured 

 pyrrhotite. In the bottom of the pit is the smoothly altered 

 slaggy remnant of the original nodule, similar to the unaltered 

 one shown in fig. 13. Some of these inclusions are sharply 

 rectangular and possess a distinct parting. Qualitative tests 



