But we need not labour the point, as it is not of primary importance.
"To return to Weiss.

He was clearly heavily disguised, as we see by his unwillingness to show himself even by the light of a candle.

But there is an item of positive evidence on this point which is important from having other bearings.

It is furnished by the spectacles worn by Weiss, of which you have heard Jervis's description.

These spectacles had very peculiar optical properties.