But since he did not mean to marry for the next five years—­ his more pressing business was to look into Louis’ new book on Fever, which he was specially interested in, because he had known Louis in Paris, and had followed many anatomical demonstrations in order to ascertain the specific differences of typhus and typhoid.  He went home and read far into the smallest hour, bringing a much more testing vision of details and relations into this pathological study than he had ever thought it necessary to apply to the complexities of love and marriage, these being subjects on which he felt himself amply informed by literature, and that traditional wisdom which is handed down in the genial conversation of men.  Whereas Fever had obscure conditions, and gave him that delightful labor of the imagination which is not mere arbitrariness, but the exercise of disciplined power—­combining and constructing with the clearest eye for probabilities and the fullest obedience to knowledge; and then, in yet more energetic alliance with impartial Nature, standing aloof to invent tests by which to try its own work.

Many men have been praised as vividly imaginative on the strength of their profuseness in indifferent drawing or cheap narration:—­ reports of very poor talk going on in distant orbs; or portraits of Lucifer coming down on his bad errands as a large ugly man with bat’s wings and spurts of phosphorescence; or exaggerations of wantonness that seem to reflect life in a diseased dream.  But these kinds of inspiration Lydgate regarded as rather vulgar and vinous compared with the imagination that reveals subtle actions inaccessible by any sort of lens, but tracked in that outer darkness through long pathways of necessary sequence by the inward light which is the last refinement of Energy, capable of bathing even the ethereal atoms in its ideally illuminated space.  He for his part had tossed away all cheap inventions where ignorance finds itself able and at ease:  he was enamoured of that arduous invention which is the very eye of research, provisionally framing its object and correcting it to more and more exactness of relation; he wanted to pierce the obscurity of those minute processes which prepare human misery and joy, those invisible thoroughfares which are the first lurking-places of anguish, mania, and crime, that delicate poise and transition which determine the growth of happy or unhappy consciousness.

As he threw down his book, stretched his legs towards the embers in the grate, and clasped his hands at the back of his head, in that agreeable afterglow of excitement when thought lapses from examination of a specific object into a suffusive sense of its connections with all the rest of our existence—­seems, as it were, to throw itself on its back after vigorous swimming and float with the repose of unexhausted strength—­Lydgate felt a triumphant delight in his studies, and something like pity for those less lucky men who were not of his profession.