London in 1900, & still struggling to make a record of his latest discoveries, “but I have to prove that we have accuracy & dogged persistence besides." He did prove it. Lord Rayleigh & Sir Wm. Crookes both told him that while the perfection of his methods was unquestioned, no one had yet been able, in 1901, to repeat his experiments of 1895-6 || His manipulation was beyond rivalry. The work of '94 to 1900 had consisted of some dozen or more separate investigations on invisible light-polarisation. The existence of a dark cross— &c. &c.— these were valuable pieces of work, full of suggestions to some of the advanced workers in Europe, who were not slow to take hints from his instruments & theories. It was apparently in the year 1900, however, that all these separated tasks began to combine in a series of great generalisations which have not yet been given to the world in their completeness, and which are to prove of wider & wider philosophic interest as time goes on. I allude to the great Theory of Stress & Strain— which, if only he can command time & strength to work it out in publication, will be held as epochmaking as Newton's Law of Gravitation— a tribute worthy of India's contributing to world-knowledge. It is the minor applications of this generalisation that have hither to attracted so much attention— one of the first discoveries to which it led was that of the Binocular Alternation of Vision. Another was of a more practical (i.e. commercial) Y & e
