48 Proceedings of the 



remains for us to refer to six additional sacculi, which are 

 more or less incomplete, and present scarcely any trace of the 

 follicular element ; two of them (15 and 16) are shallow, two 

 rather deep (17 and 18), and two (19 and 20) comparatively 

 insignificant. 



IV. Notice of the Occurrence of Meteoric Lead in Meteoric Iron from 

 Tarapaca, Chili. (Specimen exhibited.) By M. Forster Heddle, 

 M.D. 



A description of this iron, with analyses and a notice of the occurrence 

 of Lead in its cavities, having been inserted in the July Number of the 

 Philosophical Journal, I have, on the present occasion, little left me ex- 

 cept to exhibit the specimen. 



Mr Greg having observed globules of a bluish metal filling up small 

 nests in the iron, sent them to me for examination ; and it was a singu- 

 larly interesting circumstance that Professor Shepherd, of America, who 

 has devoted so much attention to meteoric bodies, was inspecting my col- 

 lection when the chips of metal reached me, and witnessed the prelimi- 

 nary investigation which introduced lead as one of the elements of those 

 mysterious bodies which visit us from parts unknown. 



By as careful and complete an analysis as the small quantity of metal 

 at my disposal enabled me to institute, I was able to detect no substance 

 in these chips but metallic lead. When these portions of the globules 

 which had been in contact with the iron were examined, small quantities 

 of iron and alumina, with traces of magnesia and phosphorus were like- 

 wise found. 



Two supposed new mineral substances which occur in this iron are in 

 my hands for examination ; the analyses of these when completed I 

 will lay before the Society. 



Slices of the iron which contains this meteoric lead have the high value 

 which is always attached to unique specimens ; and it is satisfactory to 

 know that, through the generosity of Mr Greg, one of the slices is now in 

 the College Museum. 



Alexander M. Edwards, Esq., 33 Northumberland Street ; Robert 

 Chambers jun., Esq., 1 Doune Terrace ; and James Hector, Esq,, 57 

 Inverleith Row, were balloted for, and elected members of the Society. 



