HANDBOOK OF THE METEORITE COLLECTIONS. 33 



ALGOMA POST OFFICE, KEWAUNEE COUNTY. WISCONSIN. No. 273. 



Iron, Om. Two fragments weighing 4 and 12 grams, from a mass 

 weighing a little more than 2 kilograms, found in 1887. The original 

 iron was remarkable for its discoid shape, measuring 25 by 16^ cm. 

 with a maximum thickness of 2^ cm. The chemical composition, as 

 given by Hobbs, is as follows: 



Per cent. 



Iron (Fe) 8S.Q2 



Nickel (Ni) 10-63 



Cobalt (Co) -84 



Phosphorus (P) -1^ 



Silica (SiO=) • ^2 



Sulphur (S) Trace. 



Copper (Cu) None. 



Carbon (C) None. 



100.26 



Reference.— W. H. Hobbs, Meteorite from Algoma, Wisconsin 

 Bull. Geol. Soc. America, vol. 14, 1903, p. 97. 



ALLEGAN, THOMAS HILL, ON THE SAUGATUCK ROAD, ALLEGAN COUNTY, MICHI- 

 GAN. No. 215. 



Stone, Ceo. Principal mass, covered, except where broken, with 

 thick black crust (pi. 11), and many fragments. Total weight about 

 35.5 kilograms. Fell a little after 8 o'clock on the morning of July 

 10, 1899. Flight from the northeast toward the southwest. When 

 first seen in the air (after explosion) it had the appearance of a black 

 ball, the size of a man's hand when closed, followed by a bluish cloud 

 apparently some six feet in length. The explosion was reported as 

 cannon-like, and was followed by a hissing sound compared with that 

 of an engine blowing off steam. But one mass was seen to fall, which 

 buried itself in the sand only to the depth of 18 inches. 



The chemical composition of the stone is as follows : 



Metallic part, 23.06 per cent : ^^^ '^^°t- 



Iron (Fe) •- 21.09 



Copper (Cu) -01 



Nickel (Ni) 1-81 



Cobalt (Co) -15 



Stony part, 76.94 per cent : 



Silica (SiO^) 34.95 



Titanic oxide (TiOz) -08 



Phosphoric acid (P2O5) -27 



Alumina (AUOs) 2.55 



Chromic oxide (CrjOj) -53 



Ferrous oxide (FeO) 8.47 



Ferrous sulphide (FeS) 5.05 



Manganous oxide (MnO) -18 



Nickel oxide (NiO) Trace. 



5692°— Bull. 94—16 ^3 



