...greater degree than after an immersion of three minutes only. This agrees with the results of oilier modes of trial in indicating that the latter period...the remainder appear colorless as in ordinary light. 14. On the Production of Vanilla in Europe, (Gardner's Travels in the interior of Brazil, p. 296; Jameson's...

...altered the structure of the fibres as to lessen very greatly their action on polarized light. Gun-cotton prepared by Dr. Jackson by immersion for twelve and...the remainder appear colorless as in ordinary light. 14. On the Production of Vanilla in Europe, (Gardner's Travels in the interior of Brazil, p. 296 ;...

...polarizing power as to be scarcely visible on the black ground, but none have been found entirely wilhout action. When the polarizing and analyzing prisms are...the remainder appear colorless as in ordinary light. 14. On the Production of Vanilla in Europe, (Gardner's Travels in the interior of Brazil, p. 296 ;...

...specimens there are some filaments so nearly destitute of polarizing power as to be nearly invisible on the black ground, but none have been found entirely...as to give a bright field, a portion of the fibres become tinged with a color approaching to orange, while the remainder appear colorless, as in ordinary...

...specimens there are some filaments so nearly destitute of polarizing power as to be nearly invisible on the black ground, but none have been found entirely...as to give a bright field, a portion of the fibres become tinged with a color approaching to orange, while the remainder -appear colorless, as in ordinary...