F. YELLOW.
Among the varieties of this species of colour, there are three possessing metallic lustre, viz, brass-yellow, gold-yellow, and bronze-yellow. The characteristic colour, which is lemon-yellow, is placed in the mid dle of the series ; the colours which precede it are greenish-yellow, and those which follow it are red dish-yellow. The one side of the series, by the in crease of the green, passes by sulphur yellow into green ; the other, by the increase of red, passes, by means of orange-yellow, into led. It is a frequent colour in the mineral kingdom. The following are its varieties.
a. Sulphur-yellow is lemon-yellow mixed with much emerald green and white. It is the colour of native sulphur. Example, Native sulphur.
b. Brass-uellow offers from the pi eceding colour prin cipady in having a metallic lustre; it contains a small portion of grey. Example, Copper-pyrites.
c. Straw-yellow is sulphur-yellow mixed with much greyish white. It passes into a yellowish-white and yellowish-grey. Example, Calamine, serpentine and !it! low cobalt-ochre.
d. Bronze yellow is brass-yellow mixed with a little steel-gtey, and a minute portion of reddish brown. The colour of bell-metal. Example, Iron-pyrites.
e. Wax yellow is lemon-yellow mixed with reddish brown, and a little ash-grey ; or it may be considered as honey-yellow with greyish white. It is the colour
of pure unbleached wax. Examples, Opal and yel low lead-spar.
f. Honey-yellow is sulphur-yellow mixed with chestnut brown. It passes into yellowish brown. Examples, Fluor-spar and beryl.
g. Lemon-yellow is the pure unmixed colour. It is the colour of t ipe lemons. Examples. Yellow orpiment.
h. Gold-yellow is the preceding colour with metallic lustre. Example, Native gold.
1. Ochre-yellow is lemon-yellow mixed with a considera ble quantity of light chestnut brown. It passes into yellowish brown. It is a very common colour among minerals. Examples, Yellow earth and jasper.
k. (Vine-yellow is lemon-yellow mixed with a small por-. tion of red and greyish-white. The colour of Saxon home-made wine. Examples, Saxon and Brazilian topaz.
I. Cream-yellow or Isabella-yellow. It contains more red and grey than the wine-yellow, and also a little brown. It passes into flesh-red. Examples, Bole from Strigau, and compact limestone.
m. Orange-yellow is lemon-yellow with carmine red. It is the colour of the ripe orange. Examples, Streak of red•orpiment, and uran-ochre.