336 J. Lawrence Smith on two New Minerals. 
(a.) In classification: as for example, in the 
morphology of plants, and animals, 
3. Analogies of where all the parts are deduced from 
£ ‘ > 
the Philosoph- 
the germ. 
ical or Unify- (b.) In the scientific use of judgment; as, 
when electricity, heat, gravitation, &c., 
ing, Joculty. are referred to : neneiion principle. 
(c.) In pure philosophizing ; as in attaining 
he idea of soul, substance, life. 
In the foregoing analysis I have endeavored to exhaust the 
subject of analogy in its scientific application, by considering 
every operation of the scientific intelligence in which it would 
come in play. If it is not displeasing to you, I will endeavor 
in my next, to make some practical applications of it in the the- 
ory of temperature. 
Arr. XXXV.—Two new Minerals,—Medjidite (Sulphate of 
Uranium and Lime)—Liebigite (Carbonate of Uranium and 
ime); by J. Lawrence Smiru of South Carolina, Geologist 
to the Sultan of Turkey. 
Tue minerals here alluded to were found associated with a 
+ ter of pitchblende from the neighborhood of Adrianople, 
lurkey ; it was quite impure and a portion of it contained erys- 
tals of copper pyrites. On the surface of the pitchblende, besides 
the two minerals in question, there existed erystals of sulphate of 
lime and a little oxyd of iron. 
_ Mepsorre—Sulphate of Uranium and Lime.—This mineral 
is of a dark amber color, transparent, of imperfect crystalline 
structure, fracture vitreous, although the surfaces exposed are 
sometimes of a dull yellow color, arising from the loss of water. 
It is found on the surface of the pitchblende associated in some 
places with crystals of sulphate of lime. Hardness about 2°5 
—Ssp. grav. not known. 
_ Chemical characters.—Heated gently it loses its water, becom- 
ing of a lemon yellow color. Heated to redness it blackens (being 
converted into oxyd of uranium and sulphate of lime). It is insolu- 
ble in water, but dissolves readily in the smallest quantity of dilute 
hydrochloric acid; (in this way had it been necessary I might 
have separated it from any adhering sulphate of lime.) The 
acid solution gives a tolerably abundant precipitate with hydro- 
“canine ae 
