He seems to have had a decided taste for mathematical and scientific pursuits. The writings and example of Roger Bacon had given a great stimulus to these pursuits in England, and Hallam mentions the names of several Englishmen of the fourteenth century who distinguished themselves as mathematicians, such as Archbishop Bradwardine, the profound Doctor, as he was called. Among Chaucer’s prose works is a Treatise on the Astrolabe, written for the instruction of his youngest son, Lewis, who was studying at Oxford under a tutor. He dedicates the work to his boy in the following words:—
“Lytel Lewis, my sonne, I perceive well by certaine evidences thine abilitie to learne sciences touching numbers and proportions, and also wel consider I thy busie prayer in especiall to learne the Treatise of the Astrolabie ... therefore I have given thee a sufficient Astrolabie for an orizont, compounded after the latitude of Oxenford.” He has compiled it, he adds, because the charts of the Astrolabe that he has seen were “too hard for thy tender age of ten yeares to conceive,” and he has written it in English, “for Latine ne canst thou nat yet but smal, my lytel sonne.”
In one of his poems he gives an exposition of the theory of gravitation, and appeals to Aristotle and “Dan Plato” in confirmation of his philosophy. He also explains the propagation of sound, which he declares to be produced by a series of undulations of air like those that appear when you throw a stone into the water. He was familiar with the jargon of the astrologers and alchemists, and his commentators assure us that he displays a very considerable knowledge of the real science of chemistry as well as of its quackery, which last does not escape his lash. For quacks of all sorts indeed he has no indulgence, and spends his humour on the doctor of physic, whom he describes as “well grounded in astronomy,” able to help his patients by his knowledge of magic, no great reader of his Bible, which was not a very fashionable study with the followers of Averrhoes and Avicenna, but on excellent terms with his apothecary, and ready to help him to get rid of plenty of drugs and electuaries. It will be remembered that at the time when Chaucer wrote, the “Doctor of Physic,” though a graduate of the universities, and a very important person in his way, had no great claims to the character of a man of science. John Gaddesden, a fellow of Merton, and court physician to Edward, wrote a book called the “Rosa Anglica,” on his great and successful method of treating patients for the smallpox, which consisted in hanging their rooms and enveloping their persons in scarlet cloth! He informs us that, with the blessing of God, he purposes writing another book on Chiromancy, or fortune-telling by the hand, condescends to give directions to the court ladies for preparing their perfumes, washes, and hair-dyes, and interlards his quack recipes with scraps of original verse.
In his treatment of religious subjects Chaucer represents the tone of feeling which prevailed among a very large class of Englishmen in his day. He was a political partisan of John of Gaunt, and therefore gave the Lollards a certain kind of support. To a man of free life and coarse humour it was both tempting and easy to exercise his wit on fat monks and lazy friars, and to grumble like a true Englishman at their demands on his purse. Doubtless there were plenty of unworthy representatives of both professions to stand as the originals of his poetical caricatures, and broadly enough did he paint their unseemly features. But that was all; and his biographer, Godwin, admits that, so far from sharing any of the heretical opinions of the Lollards, his poems unmistakably prove his adherence to the Catholic dogmas, especially those which they most malignantly attacked, namely, the Sacraments of Penance and the Holy Eucharist; while his devotion to the Blessed Virgin is expressed in a thousand passages, such as the following:—
Lady, when men pray to the,
Thou goest before of thy benignitie,
And getest us the light of thi prayere
To giden us to thi Sonne so dere.
Occleve, his disciple, himself no mean poet, bears testimony to the fact that his lamented master was a devout client of the Queen of Heaven:—
As thou wel knowest, O blessed Virgyne,