DR. BREWSTER ON REFLECTED LIGHT. 
197 
Image at the 
Image at the Surface of Prism A. Surface of Prism B. 
/ Above two orders of colours ; pink of second the best. Im- 1 Grayish or bluish 
\ proved by heat. / white. 
Names of Oils. 
Canada Balsam , 
Oil of Tobacco , 
Oil of Cloves . . 
Oil of Sassafras 
Balsam of Capivi 
Muriate of Antimony Two tolerably distinct orders of colours. 
Two faint orders of colours. Heat brings out nearly three. Grayish white. 
f Two faint orders. Heat brings out part of a third. First! Yellowish white 
1 limit of pink and blue about 65° of incidence. J 1 &ra ^ 
Two orders. First red pale. First blue good. 
See page 191. 
Grayish white. 
Grayish white. 
Oil of Cummin . 
L 
("Faint grayish, be- 
Two beautiful orders. A fine yellow in the second order. J coming more in- 
Heat spoils them all. ) tense and yellow 
L by heat. 
‘Two faint orders, the second red and second blue being' 
v , 1 tolerably good. Heat brings out two fine orders, the l v n ■ i i • 
Nut Od < i. ■ ? ° , Lj- „ » e0 > Yellowish white. 
Oil of Pimento . 
Oil of Sweet Fennel 
seeds 
1 Two orders ; pink good. 
Wood Oil 
Oil of Amber . 
Oil of Rhodium 
Treacle. 
Balsam of Sulphur 
Honey 
Oil of Angelica 
first limit of pink and blue ending at about 76° of inci- 
dence. 
/ Three good orders of colours. First limit of pink and/ Pale blue, very faint 
\ blue at 65° of incidence. 
/ at great incidences. 
|> Bluish gray. 
/Three good orders of colours. First pink and blue fine. 1 Bluish gray, weaker 
\ First limit of pink and blue ends at 65°. / at great incidences. 
/Two excellent orders of colours. First limit of pink and/ Pale blue, very faint 
/ blue at 65°. Improved by heat. 
J at great incidences. 
/ Two and a half good periods. First limit at 65°. Heat in- 1 Yellowish white 
^ jures them. j 
(“At temp. 50° three orders, which are not good, especially "j 
the pink of first and blue of second order. Heat brings ^Yellowish white. 
L out three splendid orders with periods, as in castor oil*. J 
f Three fine orders. First limit of pink and blue at about X^me^and^^hier 
(_at great incidences. 
{ Slightly yellowish 
white. 
67°. 
1 
<^Two pretty good orders. First limit at about 65°. 
f Two and a half orders. First pink and first blue fine ; se-l -yyiiitish ellow 
\ cond red good. / j ' ■ 
Oil of Nutmeg. . . . Three not very bright orders. First limit at 73°. 
Whitish yellow. 
* The treacle used in this experiment is much inferior in refractive power to the prism A. 
