Many persons fancy that "it must be very nice to be always making experiments," and that they "should be delighted with such an occupation" if they "could only spare the time." But such an idea is only another illustration of the general ignorance of the subject, and it is only expressed by those who have never made a laborious and difficult research. Pure research is by far the most difficult of all scientific occupations, and this is another chief reason why discoverers are few, and why they will probably remain so. To succeed in research, a man must set aside all human pride, and approach the subject with perfect humility; and this is not an easy task, men cannot so readily abandon preconceived and cherished notions. Many researches are moreover extremely dangerous. Thilorier was killed by the explosion of a vessel of liquefied carbonic anhydride; Dulong lost an eye and finger, and Sir Humphrey Davy was wounded by an explosion of chloride of nitrogen. Faraday was near being blinded by an experiment with oxygen. Nicklès of Nancy, and Louyet of Brussels, lost their lives, and two other chemists were seriously injured in health by exposure to the excessively dangerous fumes of hydrofluoric acid. Bunsen lost the sight of an eye and was nearly poisoned by an explosion whilst analysing cyanide of cacodyl.[34] Hennel was killed by an {195} explosion of fulminate of silver, and Chapman by one of nitrate of methyl; and nearly every chemical investigator could tell of some narrow escape of life in his own experience. Any one who wishes to know whether it is "very nice to be always making experiments" should attempt the isolation of fluorine, the chemical examination of some offensive substance, or the determination of some difficult physical, or chemical problem. That a professorship of original research would "involve substantial work" does not admit of doubt, and therefore "there would be some security that it would be worthily bestowed." It would not become an "ornamental sinecure," in which "there is pay but no work," unless, by assigning to it too large a stipend, inducement was held out to that numerous class of persons whose love of money is stronger than their love of truth, to seek the office; to say the utmost, it could hardly become so largely a sinecure as many offices now held by ecclesiastics. Jobbery and abuse of patronage would be still further prevented by making the duties sufficiently heavy.