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producing the effect foreseen by Sir H。 Davy；the preventing the corrosion of the copper； but it failed as a cure of the evil； by producing one of an OPPOSITE character； either by preserving too perfectly from decay the surface of the copper； or by rendering it negative； it allowed marine animals and vegetables to accumulate on its surface； and thus impede the progress of the vessel。＇
Other instances might； if necessary； be adduced； to show that long intervals frequently elapse between the discovery of new principles in science and their practical application： nor ought this at all to surprise us。 Those intellectual qualifications； which give birth to new principles or to new methods； are of quite a different order from those which are necessary for their practical application。
At the time of the discovery of the beautiful theorem of Huygens； it required in its author not merely a complete knowledge of the mathematical science of his age； but a genius to enlarge its boundaries by new creations of his own。 Such talents are not always united with a quick perception of the details； and of the practical applications of the principles they have developed； nor is it for the interest of mankind that minds of this high order should lavish their powers on subjects unsuited to their grasp。
In mathematical science； more than in all others； it happens that truths which are at one period the most abstract； and apparently the most remote from all useful application； become in the next age the bases of profound physical inquiries； and in the succeeding one； perhaps； by proper simplification and reduction to tables； furnish their ready and daily aid to the artist and the sailor。
It may also happen that at the time of the discovery of such principles； the mechanical arts may be too imperfect to render their application likely to be attended with success。 Such was the case with the principle of the hydrostatic paradox； and it was not； I believe； until the expiration of Mr。 Bramah's patent； that the press which bears his name received that mechanical perfection in its execution； which has deservedly brought it into such general use。
On the other hand； for one person who is blessed with the power of invention； many will always be found who have the capacity of applying principles； and much of the merit ascribed to these applications will always depend on the care and labour bestowed in the practical detail。
If； therefore； it is important to the country that abstract principles should be applied to practical use； it is clear that it is also important that encouragement should be held out to the few who are capable of adding to the number of those truths on which such applications are founded。 Unless there exist peculiar institutions for the support of such inquirers； or unless the Government directly interfere； the contriver of a thaumatrope may derive profit from his ingenuity； whilst he who unravels the laws of light and vision； on which multitudes of phenomena depend； shall descend unrewarded to the tomb。
Perhaps it may be urged； that sufficient encouragement is already afforded to abstract science in our different universities； by the professorships established at them。 It is not however in the power of such institutions to create； they may foster and aid the development of genius； and； when rightly applied； such stations ought to be its fair and honourable rewards。 In many instances their emolument is small； and when otherwise； the lectures which are required from the professor are not perhaps in all cases the best mode of employing the energies of those who are capable of inventing。
I cannot resist the opportunity of supporting these opinions by the authority of one of the greatest philosophers of a past age； and of expressing my acknowledgments to the author of a most interesting piece of scientific biography。 In the correspondence which terminated in the return of Galileo to a professorship in his native country； he remarks； 〃But； because my private lectures and domestic pupils are a great hinderance and interruption of my studies； I wish to live entirely exempt from the former； and in great measure from the latter。〃LIFE OF GALILEO； p。18。 And； in another letter to Kepler； he speaks with gratitude of Cosmo； the Grand Duke of Tuscany； who 〃has now invited me to attach myself to him with the annual salary of 1000 florins； and with the title of Philosopher and principal Mathematician to his Highness； without the duties of any office to perform； but with most complete leisure； so that I can complete my treatise on Mechanics； &c。〃p。31。〃 ＇Life of Galileo； published by the Society for the Diffusion of Useful Knowledge。＇
Surely； if knowledge is valuable； it can never be good policy in a country far wealthier than Tuscany； to allow a genius like Mr。 Dalton's； to be employed in the drudgery of elementary instruction。 ＇I utter these sentiments from no feelings of private friendship to that estimable philosopher； to whom it is my regret to be almost unknown； and whose modest and retiring merit； I may； perhaps； have the misfortune to offend by these remarks。 But Mr。 Dalton was of no party； had he ever moved in that vortex which has brought discredit； and almost ruin； on the Royal Society of England；had he taken part with those who vote to each other medals； and； affecting to be tired of the fatigues of office； make to each other requisitions to retain places they would be most reluctant to quit； his great and splendid discovery would long since have been represented to government。 Expectant mediocrity would have urged on his claims to remuneration； and those who covered their selfish purposes with the cloak of science； would have hastened to shelter themselves in the mantle of his glory。But the philosopher may find consolation for the tardy approbation of that Society； in the applause of Europe。 If he was insulted by their medal； he escaped the pain of seeing his name connected with their proceedings。＇ Where would have been the military renown of England； if； with an equally improvident waste of mental power； its institutions had forced the Duke of Wellington to employ his life in drilling recruits； instead of planning campaigns？
If we look at the fact； we shall find that the great inventions of the age are not； with us at least； always produced in universities。 The doctrines of 〃definite proportions；〃 and of the 〃chemical agency of electricity；〃 principles of a high order； which have immortalized the names of their discoverers； were not produced by the meditations of the cloister： nor is it in the least a reproach to those valuable institutions to mention truths like these。 Fortunate circumstances must concur； even to the greatest； to render them eminently successful。 It is not permitted to all to be born； like Archimedes； when a science was to be created； nor； like Newton； to find the system of the world 〃without form and void；〃 and； by disclosing gravitation； to shed throughout that system the same irresistible radiance as that with which the Almighty Creator had illumined its material substance。 It can happen to but few philosophers； and but at distant intervals； to snatch a science； like Dalton； from the