No. 161.] 
149 
Mica slate contains nealy the same metals as gneiss. Iron ore, 
both oxide and carbonate of iron, lead, zinc and copper, are found in 
this rock in this country: gold and silver mines are also found in 
this rock, in some parts of the world. 
Talcous slate contains gold, iron, copper and manganese. 
Sandstone sometimes contains copper, but not often in sufficient 
quantities for working. 
Limestone contains lead, zinc, copper, silver and iron. 
It is not intended to convey the idea, that all the metals here 
mentioned, will be found in this district, nor only a very few of 
them. It would be unwise, at this time, to predict what will or will 
not be found in any part of the State, and especially so in the north- 
ern part, or the second district. Iron ore in abundance, and favor 
able indications of profitable veins of lead, zinc and copper, have 
been discovered. 
Fresh water Marl, 
As a fact favorable to the agricultural interests of the northern 
part of the State, I might mention the discovery of fresh water 
marl, in the town of Edwards, St. Lawrence county. The depo- 
site of marl is in a pond, or swamp, supplied with water from a 
spring; the marl is a few inches beneath the water; it contains the 
species of Helix, &c., usually found in these marls. Its location is 
among the granite and limestone mountains of this region, upon 
the soil of which, this marl would be highly beneficial. There are, 
in several other places, indications of lakes and swamps having 
been drained, and perhaps we may here find similar deposites; at 
least, these places are deserving of examination. 
