21 
vrase: It has hitherto been only found at Kosemlltz 
in Silesia, accompanied by a siliceous earthy sub¬ 
stance calledwhich, like the chrysoprase, 
owes its green colour to oxide of nickel.-—By way 
of appendix to the calcedonic substances, are added 
a few specimens of the less compound varieties of 
agates, in which common calcedony, carnelian, and 
heliotrope respectively form the predominant ingre¬ 
dients.—Of flint, a well known mineral substance, 
several interesting varieties are deposited in this 
case. 
(6V/^^8.) contains principally opaline substances, 
viz. specimens of the nolle opal, which owes its 
beautiful play of colours to a multiplicity of imper¬ 
ceptible fissures in its interior; the Mexican sun 
or fire opal; common opal, a translucent white 
variety of which, appearing yellow or red when held 
between the eye and the light, is called girasol; the 
semi-opal, agreeing in its principal characters with 
the common ; specimens of those varieties which, 
having the property of becoming transparent when 
immersed in water, are called hydrophanes, and vul¬ 
garly oculus iiiundi; luood-opal, or opalized wood ; 
jasp-opal, referred by some authors to jasper; the 
menilite, called also liver-opal, found at Meriil- 
Montant, near Paris, in a bed of adhesive slate, a 
specimen of which is added. Some varieties of 
cacholohg may likewise be referred to the opal-tribe. 
—The remainder of this case is occupied by the si ^ 
liceous 
SALOON. 
Nat. Hist. 
