"These people consider that in the vril they had arrived at the unity in natural energic agencies...under the more cautious term of correlation... I have long held an opinion, almost amounting to a conviction, in common, I believe, with many other lovers of natural knowledge, that the various forms under which the forces of matter are made manifest, have one common origin; or, in other words, are so directly related and naturally dependent, that they are convertible, as it were, into one another, and possess equivalents of power in their action."