We are not surprised to find that Bacon should praise those of his contemporaries who devoted themselves to mathematics and to experimental observations in science. Of one of his correspondents who even from distant Italy sent him his observations in order that he might have the great Franciscan's precious comments on them. Bacon has given quite a panegyric. The reasons for his praise, however, are so different from those which are ordinarily proclaimed to have been the sources of laudation in distant medieval scientific circles, that we prefer to quote Bacon's own words from the Opus Tertium. Bacon is talking of Petrus Peregrinus and says: "I know of only one person who deserves praise for his work in experimental philosophy, for he does not care for the discourses of men and their wordy warfare, but quietly and diligently pursues the works of wisdom. Therefore, what others grope after blindly, as bats in the evening twilight, this man contemplates in all their brilliancy because he is a master of experiment. Hence, he knows all natural science whether pertaining to medicine and alchemy, or to matters celestial and terrestrial. "He has worked diligently in the smelting of ores as also in the working of minerals; he is thoroughly acquainted with all sorts of arms and implements used in military service and in hunting, besides which he is skilled in agriculture and in the measurement of lands. {45} It is impossible to write a useful or correct treatise in experimental philosophy without mentioning this man's name. Moreover, he pursues knowledge for its own sake; for if he wished to obtain royal favor, he could easily find sovereigns who would honor and enrich him." [Illustration] CATHEDRAL (YORK) [Illustration] CATHEDRAL (HEREFORD) Lest it should be thought that these expressions of laudatory appreciation of the great Thirteenth Century scientist are dictated more by the desire to magnify his work and to bring out the influence in science of the Churchmen of the period, it seems well to quote an expression of opinion from the modern historian of the inductive sciences, whose praise is scarcely if any less outspoken than that of others whom we have quoted and who might be supposed to be somewhat partial in their judgment. This opinion will fortify the doubters who must have authority and at the same time sums up very excellently the position which Roger Bacon occupies in the History of Science.