There is advancement, too, in other quarters. Faraday has been diligently pursuing his investigations into the phenomena of electricity and magnetism through greater part of the dead season, and will be prepared erelong to make the results public. And Professor Stokes's researches and experiments on light, which have been laid before the British Association and the Royal Society, are regarded by competent judges as the most remarkable and fruitful that have been made for many years. Another means of advance will perhaps be found in the new process for 'illuminating' glass, by which lenses of all sizes, from spectacles to telescopes, may be made so much brighter and more transparent, as to increase their power and utility to an extraordinary degree. We are shortly to have further particulars concerning this improvement, which, if it be such as described, and applicable to microscopes, will perhaps enable Ehrenberg to verify the opinions he has lately formed concerning the atmosphere--namely, that it is not less full of organic and inorganic life than the ocean, or any other part of creation.
Mr Westwood has read a paper before the Zoological Society, 'On the Destructive Species of certain Insects known in Africa,' in which he shows the probability of their having been the insects of the fourth plague recorded in the Pentateuch. Some of them are the _Oestridæ_; and one kind known in Africa as _Tsetse_, is so fierce and venomous, that a few of them are sufficient to sting a horse to death: they are the same as the _Zimb_, of which Bruce gives such a striking account. Their presence appears to be mainly determined by the nature of the soil, for they are seldom found away from the black earth peculiar to the Valley of the Nile. Among the carvings on the ancient tombs, this insect is supposed to be represented. With regard to another species of insect, Dr Macgowan states, that the insect-wax of China, of which 400,000 pounds are produced annually, is not, as has long been believed, a 'saliva or excrement,' but 'that the insect undergoes what may be styled a ceraceous degeneration, its whole body being permeated by the peculiar produce in the same manner as the _Coccus cacti_ is by carmine.'