For more than a decade the irregularities in the motion of Uranus (itself not long discovered) had suggested to astronomers that there must be another planet exterior to it, when, in 1841, John Couch Adams, then only an undergraduate of St. John's College, set himself to grapple with the arduous task of finding by analytical computation the orbit and place of this supposititious body. So stupendous were the difficulties that when, after four years of concentrated effort, he submitted his results to the Astronomer Royal, begging that the planet might be looked for in a certain spot (where we now know that it actually was visible at the time), his suggestion received very incredulous acceptance. Was it likely that a mere youth should have solved this gigantic problem? That very autumn of 1845 another young man, quite independently, devoted himself to the same quest, the brilliant French mathematician Leverrier. He, in the following summer, published the results he had so far attained. Adams had never published; but these new results so strikingly agreed with his that the Astronomer Royal's incredulity gave way, and he desired that search should be made with the great equatorial telescope, then newly erected at Cambridge through the generosity of the Duke of Northumberland. His injunctions were carried out; but the lack of a trustworthy star map made the work long. And it was made longer by lack of promptitude. The minute celestial object (only equal to a star of the eighth magnitude) had been actually seen, but further observations were needed to establish the fact that it was indeed a planet moving amongst the stars around it. And these observations were delayed at the crucial point by the observers adjourning for a cup of tea! When they returned the sky had clouded over and no favourable night occurred for many evenings after. Meanwhile Leverrier had called in the aid of the Berlin Observatory; where there did exist a good star map, and also the eagerness so sadly lacking here at Cambridge. The very day his letter was received (23rd September, 1846), the great Berlin telescope was directed to the spot which he indicated,--and there was the planet. The story goes that when the tidings of this overthrow of hope reached Cambridge, and were reported to the Fellows of Trinity as they sat at dinner in their Hall, it was as if a thunderbolt had fallen amongst them: "And all talk died, as in a grove all song Beneath the shadow of some bird of prey; Then a long silence came upon the Hall,"