194 <A. A Hayes—Red Oxide of Zinc of New Jersey. 
Fragments of larger size may be covered with acetic hy- 
drate (No. 8of the shops). The assay dissolves as quietly as 
would sugar, and the line of contact of assay with acid never 
shows a dilution of color. Points of scales, having right-lined 
forms, appear, and can be moved so as to transmit or reflect 
and hence it acts most rapidly on the more basic elements 0 
the ore, and in so doing allows the foreign bodies only slightly 
altered to come in view. rom the scales, little clouds arise 
and float away, often carrying the specular iron scales, ap 
decomposing light. In this way, beautiful hues accompany the 
chemical and mechanical actions, and the latter show the con- 
stitution and compound nature of these scales. 
Sulphuric hydrate, so diluted as to form the brilliant trans- 
parent rhombic prisms of zinc-sulphate, in acting on the assay 
in a saturated solution, transfers the scales in the assay to the 
colorless crystals forming. e get the scales of specular iron 
arranged in the axes of the prisms of little crystals; but the 
charms of color, luster and action on light are so far lost, that 
the ordinary exhibition of translucent scales engaged in a trans- 
parent medium alone is given. 
lustrous mineral, decomposed by the feeblest acids, become 
evident. That the color of this ore is not produced by sh 
inhering coloring matter, but results from the action of intrud- 
trustworthy in proving the absence of any oxide of manganes® 
higher than protoxid 
e. 
Composition. Retaining the numbers obtained in 1845, after 
