308 MINERALOGY: G. P. MERRILL 
In alphabetical order the stones tested are as follows : 
Alfianello, positive lime reaction Holbrook, positive lime reaction 
Beaver Creek, negative lime reaction Homestead, positive lime reaction 
Bishopville, positive lime reaction Knyahinya, negative lime reaction 
Cullison, positive lime reaction L'Aigle, positive lime reaction 
Dhurmsala, positive lime reaction Mocs, positive lime reaction 
Dores dos Campos, positive lime reaction Monroe, negative lime reaction 
Estherville, positive lime reaction New Concord, doubtful lime reaction 
Farmington, faint positive lime reaction Pamallee, faint positive lime reaction 
Fayette, positive lime reaction Pultusk, positive lime reaction 
Felix, positive lime reaction Quenggouk, positive lime reaction 
Forest City, positive lime reaction Tennasilm, positive lime reaction 
Hessle, faint positive lime reaction 
The mere presence of a soluble calcium compound does not necessarily 
prove the presence of oldhamite, but in cases where the boiling is ac- 
companied by a liberation of H2S, it would seem safe to assume its pres- 
ence in this form, and in the cases of the stones of Alfianello, Bishop- 
ville, and Indarch we have been able from the lime in the water solu- 
tion to calculate its approximate percentage amount. 
That the mineral occurs more or less sporadically is suggested by 
Maskelyne's figure and description of the Busti stone, and has been 
demonstrated by our own researches, certain individuals from the Pul- 
tusk fall giving abundant indications of its presence, while others gave 
no sign. It is evident, however, that the mineral is a common and wide- 
spread constituent, and the examination of no stone meteorite should 
be regarded as complete unless it has been sought for by both optical 
and chemical means. A failure to find it in thin sections may be due 
to the breaking out of the granules in the process of grinding, or more 
likely, particularly in the case of stones that have lain long in the ground, 
to its having undergone alteration into an earthy, gypseous, and quite 
unrecognizable product. 
1 Sitz. Wien. Akad., 88, No. 1, p. 355 (1883). 
- Bull. Soc. Set. Nat. Quest, ser. 2, 6, 81-112 (1906). 
^Proc. U. S. Nat. Mus., 32, 243 (1907). 
<Ibid., 24, 196 (1901). 
^ Bull, de la Com.. Geol. de Finlande, No. 34, 1912, p. 43. 
® Indices of Refraction of Minerals, in MS. 
' Bulletin 509, U. S. Geol. Survey, p. 599. 
^Min. u. Pet. Mittheil., 25, 188 (1906). 
» Phil. Trans. R. Soc. London, 160, 189-214 (1870). 
'^Amer. J. Scl., 11, 149 (1896). 
" Proc. U. S. Nat. Mus., 44, 330 (1913). 
1- Proc. U. S. Nat. Mus., 1915. 
Die Meteoriten vo?i Hvittis in Marjalahti, 1903. 
1* Ann. S. African Mus., 5, 1-16 (1906). 
15 Proc. U. S. Nat. Mus., 34, 433 (1908). 
