W. M. Foote — Shower of Meteoric Stones, Arizona. 453 



Weight magnetic portion, actual 4-90 



Weight non-magnetic portion, actual . . 95* 



Weight magnetic portion, corrected 3*675 



The corrected weights give the following percentage for the 

 aerolite : 



Nickel-iron 3-68 



Silica . . 96-32 



100-00 



Analysis magnetic concentrates. 



Silica 14-12 



Iron 60-64 



Nickel 11-84 



Corrected for 25 per cent non-magnetic minerals present. 



Iron 80-86 



Nickel 15-79 



Astronomical Relationship. 



Astronomers have long debated the question as to whether 

 the fall of the Mazapil (Mexico) iron* on Nov. 27th, 1885, 

 proved it to be actually a member of the swarm of Leonids or 

 November meteors seen numerously on the same night, or 

 whether the occurrences were purely coincidental. 



The well-known August or Perseid meteors are seen from 

 July llth to August 22d (Denning), and reach a maximum on 

 August 10th to 13th, while the lesser Aqnarids reach their 

 maximum on July 28th. Their nearness suggested an inquiry 

 as to a possible relationship between these star showers and the 

 Hoi brook meteorites. 



Apprized of the circumstances of the Holbrook fall, Prof. 

 Eric JJoolittle, Director of the Flower Observatory, University 

 of Pennsylvania, wrote as follows : — 



October 5, 1912. 



I was greatly interested in your account of the extraordinary 

 fall of meteoric material in Arizona on the evening of July 19th, 

 last, and I take great pleasure in giving you what information I 

 can regarding the known meteoric showers which may be expected 

 at about this date. 



The nearest bright shower in point of time is undoubtedly that 

 known as the Aquarid shower, which reaches its maximum on July 



*See this Journal, xxxiii, 221, 1885. 



Am. Jour. Sci.— Fourth Series, Vol. XXXIV, No. 203.— November, 1912. 

 30 



