He was without instruments or means of experiment. "Without mathematical instruments no science can be mastered," he complains afterwards, "and thse instruments are not to be found among the Latins, nor could they be made for two or three hundred pounds. Besides, better tables are indispensably necessary, tables on which the motions of the heavens are certified from the beginning to the end of the world without daily labour, but these tables are worth a king's ransom, and could not be made without a vast expense. I have often attempted the composition of such tables, but could not finish them through failure of means and the folly of those whom I had to employ." Books were difficult and sometimes even impossible to procure. " The philosophical works of Aristotle, of Avicenna, of Seneca, of Cicero, and other ancients cannot be had without great cost; their principal works have not been translated into Latin, and copies of others are not to be found in ordinary libraries or elsewhere. The admirable books of Cicero de Republica are not to be found anywhere, so far as I can hear, though I have made anxious inquiry for them in different parts of the world, and by various messengers. I could never find the works of Seneca, though I made diligent search for them during twenty years and more.

And so it is with many more most useful books connected with the science of morals." It is only words like these of his own that bring home to us the keen thirst for knowledge, the patience, the energy of Roger Bacon. He returned as a teacher to Oxford, and a touching record of his devotion to those whom he taught remains in the story of John of London, a boy of fifteen, whose ability raised him above the general level of his pupils. " When he came to me as a poor boy," says Bacon, in recommending him to the Pope, " I caused him to be nurtured and instructed for the love of God, especially since for aptitude and innocence I have never found so towardly a youth. Five or six years ago I caused him to be taught in languages, mathematics, and optics, and I have gratuitously instructed him with my own lips since the time that I received your mandate. There is no one at Paris who knows so much of the root of philosophy, though he has not produced the branches, flowers, and fruit because of his youth, and because he has had no experience in teaching.

But he has the means of surpassing all the Latins if he live to grow old and goes on as he has begun".

The pride with which he refers to his system of instruction was justified by the Wide extension which he gave to scientific teaching in Oxford. It is probably of himself that he speaks when he tells us that " the science of optics has not hitherto been lectured on at Paris or elsewhere among the Latins, save twice at Oxford." It was a science on which he had laboured for ten years. But his teaching seems to have fallen on a barren soil. From the moment when the friars settled in the Universities scholasticism absorbed the whole mental energy of the student world. The temper of the age was against scientific or philosophical studies. The older enthusiasm for knowledge was dying down; the study of law was the one source of promotion, whether in Church or state; philosophy was discredited, literature in its purer forms became almost extinct. After forty years of incessant study, Bacon found himself in his own words "unheard, forgotten, buried." He seems at one time to have been wealthy, but his wealth was gone. " During the twenty years that I have specially laboured in the attainment of wisdom, abandoning the path of common men, I have spent on these pursuits more than two thousand pounds, on account of the cost of books, experiments, instruments, tables, the acquisition of languages, and the like.

Add to all this the sacrifices I have made to procure the friendship of the wise, and to obtain well-instructed assistants." Ruined and baffled in his hopes, Bacon listened to the counsels of his friend Grosseteste and renounced the world. He became a friar of the order of S. Francis, an order where books and study were looked upon as hindrances to the work which it had specially undertaken, that of preaching among the masses of the poor. He had written hardly anything. So far was he from attempting to write, that his new superiors had prohibited him from publishing anything under pain of forfeiture of the book and penance of bread and water. But we can see the craving of his mind, the passionate instinct of creation which marks the man of genius, in the joy with which he seized the strange opportunity which suddenly opened before him. "Some few chapters on different subjects, written at the entreaty of friends," seem to have got abroad, and were brought by one of his chaplains under the notice of Clement the Fourth. The Pope at once invited him to write. Again difficulties stood in his way. Materials, transcription, and other expenses for such a work as he projected would cost at least 60, and the Pope had not sent a penny.

He begged help from his family, but they were ruined like himself. No one would lend to a mendicant friar, and when his friends raised the money it was by pawning their goods in the hope of repayment from Clement. Nor was this all; the work itself, abstruse and scientific as was its subject, had to be treated in a clear and popular form to gain the Papal ear. But difficulties which would have crushed another man only roused Roger Bacon to an almost superhuman energy. In little more than a year the work was done. The "greater work," itself in modern form a closely printed folio, with its successive summaries and appendices in the "lesser " and the "third " works (which make a good octavo more) were produced and forwarded to the Pope within fifteen months.

No trace of this fiery haste remains in the book itself. The "Opus Majus " is alike wonderful in plan and detail. Bacon's main plan, in the words of Dr. Whewell, is "to urge the necessity of a reform in the mode of philosophizing, to set forth the reasons Why knowledge had not made a greater progress, to draw back attention to sources of knowledge which had been unwisely neglected, to discover other sources which were yet wholly unknown, and to animate men to the undertaking by a prospect of the vast advantages which it offered." The developement of his scheme is on the largest scale; he gathers together the whole knowledge of his time on every branch of science which it possessed, and as he passes them in review he suggests improvements in nearly all. His labours, both here and in his after works, in the field of grammar and philology, his perseverance in insisting on the necessity of correct texts, of an accurate knowledge of languages, of an exact interpretation, are hardly less remarkable than his scientific investigations. But from grammar he passes to mathematics, from mathematics to experimental philosophy.

Under the name of mathematics was included all the physical science of the time. " The neglect of it for nearly thirty or forty years," pleads Bacon passionately, "hath nearly destroyed the entire studies of Latin Christendom. For he who knows not mathematics cannot know any other sciences; and what is more, he cannot discover his own ignorance or find its proper remedies." Geography, chronology, arithmetic, music, are brought into something of scientific form, and the same rapid examination is devoted to the question of climate, to hydrography, geography, and astrology. The subject of optics, his own especial study, is treated with greater fulness; he enters into the question of the anatomy of the eye, besides discussing the problems which lie more strictly within the province of optical science. In a word, the "Greater Work," to borrow the phrase of Dr. Whewell, is "at once the Encyclopaedia and the Novum Organum of the thirteenth century." The whole of the after works of Roger Bacon - and treatise after treatise has of late been disentombed from our libraries - are but developements in detail of the magnificent conception he had laid before Clement. Such a work was its own great reward. From the world around Roger Bacon could look for and found small recognition.

No word of acknowledgement seems to have reached its author from the Pope. If we may credit a more recent story, his writings only gained him a prison from his order. "Unheard, forgotten, buried," the old man died as he had lived, and it has been reserved for later ages to roll away the obscurity that had gathered round his memory, and to place first in the great roll of modern science the name of Roger Bacon.