XVII

i8û-i. Miller, On the Form and optical Constants of Anhydrite. Phil.

Mag.,\\\. 178.

i8Aa. Brewsteb, On the Polarisation Microscop, /o"' Uep. of Brh. 4swc.,

i84-3. Miller, On the optical Constants of Tourmaline. Dioptas and

Anastas, Phil. Mag., (3), XXI, 377.

i8à3. Mac Cullagh, On the Dispersion of the optical Axes in biaxial Crys-

tals . Phil. Mag. , ( 3 ) , XXI , -293. iSàli. Amici, Xotc sur un a[)pareil de polarisation. — Description du petit

microscope achromatique de M. Amici. Ann. de chini. et de phys.,