On my quires at Cambridge I was working on the effects of separating the object-glass lenses, with the view of correcting the secondary spectrum: and on Jan. 31st I received some numbers (indices of refraction) from Mr Herschel, and reference to Fraunhofer's numbers.

The former pass through the prisms, P{1}P{2}, and are focused to form a spectrum by a lens, L{3}, on D, a movable ground glass screen.

The star near [chi]' Orionis, discovered by Gore, in December, 1885, gives a similar spectrum, which affords additional evidence that it is a variable of the same class as o Ceti.

They often suffer much from torturing boring headaches, and a consequent despondency and feeling of hopelessness which colors gray the entire spiritual spectrum.

After such a watching as this, the very eye becomes disordered, as after looking at a bright color it sees a spectrum of a totally different tint; and, when the long looked-for person appears, he himself looks unnatural at first, and strange.

No, I will just shake my soft beard of fine mist back and forth across the sky, a spectrum for the sunrays.