Careful observation had shown that in Missouri this was not the 

 case. In this State the deposits of lead occur mainly in the lower 

 magnesian, except in the Granby and Joplin regions, where they 

 occur in the lower carboniferous limestone. All the lead ore is 

 found in deposits formed later than the rocks inclosing them — 

 not in true fissure veins but in gash veins, and disseminated de- 

 posits in openings produced in weathering and filled later with the 

 metal. Of this process of leeching, and subsequent filling with 

 lead, the St. Joe, Desloge and Mine LaMotte mines are excellent 

 examples. Lead had never been found in Missouri in the solid 

 unaltered rock. All the deposits are comparatively .superficial, 

 and there is evidence to show that these deposits were laid down 

 subsequent to the coal measures. 

 Academy adjourned. 



June I, 1885. 



The Academy met Monday evening, June ist, 1885, at the 

 Academy rooms. President Nipher in the chair, and Messrs. Hu- 

 nicke, Wheeler, Tivy, Livermore, Todd, Hambach, Leete, Pritch- 

 ett. Potter, and Engler, present. 



The minutes of the last meeting were read and approved. 



The Secretary read a letter from Mrs. Albert Todd, expressing 

 htr appreciation of the memorial to her deceased husband which 

 the Academy had placed on record at the last meeting. 



Dr. Hambach exhibited an example of a species of Pionocri- 

 nus, found at St. Charles, Mo., in the St. Louis limestone, which 

 was remarkable because the genus to which it belongs has not 

 been previously found in the United States. 



Mr. Wheeler exhibited some specimens of bituminous coal from 

 a coal-pocket in the Lower Silurian sandstone in Crawford coun- 

 ty, Missouri. 



This pocket is one of the most southern of the numerous isolated local ba- 

 sins, or pockets, of coal that occur in Central Missouri. This pocket has 

 a thickness of 40 feet as far as developed, and may extend farther. As is 

 usual with these displaced and fallen pockets or blocks of coal measures, 

 the coal presents the appearance of having been much crushed and again 

 consolidated, as but little of the bedded character of common coal is to 

 be seen — for the most part looking like consolidated bituminous mud. 



