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Colours reflected.	Thickness in thousandth parts of an inch.			Names of the Colours, or substances having them.
	In air.	In water.	In glass.
1st Order.
Very black	$1 / 2$	$3 / 8$	$10 / 31$
Black	1	$3 / 4$	$20 / 31$
Beginning of black	2	1 $1 / 2$	1 $2 / 7$
Blue	2 $2 / 5$	1 $4 / 5$	1 $11 / 20$	Whitish sky-blue.
White	5 $1 / 4$	3 $7 / 8$	3 $2 / 5$	Tarnished silver.
Yellow	7 $1 / 9$	5 $1 / 3$	4 $3 / 5$	Straw colour.
Orange	8	6	5 $1 / 6$	Dried orange-peel.
Red	9	6 $3 / 4$	5 $4 / 5$	Geranium Sanguineum.
2nd Order.	——————	——————	——————	————————————
Violet	11 $1 / 6$	8 $3 / 8$	7 $1 / 5$	Iodine.
Indigo	12 $5 / 6$	9 $5 / 8$	8 $2 / 11$	Indigo.
Blue	14	10 $1 / 2$	9	Cobalt blue.
Green	15 $1 / 8$	11 $1 / 3$	9 $5 / 7$	Water, aquamarine.
Yellow	16 $2 / 7$	12 $1 / 5$	10 $2 / 5$	Lemon.
Orange	17 $2 / 9$	13	11 $1 / 9$	Orange.
Bright red	18 $1 / 5$	13 $3 / 4$	11 $5 / 6$	Bright May-pink.
Scarlet	19 $2 / 3$	14 $3 / 4$	12 $2 / 3$
3rd Order.	——————	——————	——————	————————————
Purple	21	15 $3 / 4$	13 $11 / 20$	Flax-blossom.
Indigo	22 $1 / 10$	16 $4 / 7$	14 $1 / 4$	Indigo.
Blue	23 $2 / 5$	17 $11 / 20$	15 $1 / 10$	Prussian blue.
Green	25 $1 / 5$	18 $9 / 10$	16 $1 / 4$	Bright meadow green.
Yellow	27 $1 / 7$	20 $1 / 3$	17 $1 / 2$	White wood.
Red	29	21 $3 / 4$	18 $5 / 7$	Rose.
Bluish red	32	24	20 $2 / 3$
4th Order.	——————	——————	——————	————————————
Bluish green	34	25 $1 / 2$	22
Green	35 $2 / 7$	26 $1 / 2$	22 $3 / 4$	Emerald.
Yellowish green	36	27	23 $2 / 9$
Red	40 $1 / 3$	30 $1 / 4$	26	Pale pink.
5th Order.	——————	——————	——————	————————————
Greenish blue	46	34 $1 / 2$	29 $2 / 3$	Sea-green.
Red	52 $1 / 2$	39 $3 / 8$	34	Pale pink.
6th Order.	——————	——————	——————	————————————
Greenish blue	58 $3 / 4$	44	38	Light sea-green.
Red	65	48 $3 / 4$	42	Paler red.
7th Order.	——————	——————	——————	————————————
Greenish blue	71	53 $1 / 4$	45 $4 / 5$	Very faint.
Ruddy white	77	57 $3 / 4$	49 $2 / 3$	Ditto.

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