Next to Darwin lies the famous astronomer, Sir John Frederick Herschel, who died in 1871. Another astronomer, John Couch Adams, discoverer of the planet Neptune, has a memorial in this same north aisle. Close by are memorials to James Prescott Joule, who discovered certain laws connected with heat and electricity, and to Sir George Gabriel Stokes. A little farther down the aisle is the grave of the great geologist, Sir Charles Lyell, who died in 1875. His bust is placed near the tablet in memory of Dr. John Woodward, who lived in the eighteenth century, and who has been called the “father of English Geology.” On the other side of the Nave is a memorial to William Buckland, Dean of Westminster, who was twice President of the Geological Society, and wrote many books about geology. In the South Transept, near the monument of Dr. Busby, is the grave of William Spottiswoode, who was President of the Royal Society and Printer to Queen Victoria. He died in 1883. One of the most famous men of science of our own day, William Thomson, Lord Kelvin, rests close to Newton. He was born in 1824, and died in 1907, and devoted his long life to the pursuit of science,—to what is called “applied science” as well as to speculative science. We owe to Lord Kelvin many of the wonderful inventions now in quite common use,—in navigation, in telegraphing under the ocean, and in other ways. One of the most important changes in the life of the whole nation was brought about in the nineteenth century by the introduction of railway travelling. Those of us who are quite young, and have hardly ever heard of a time when there were no railways, cannot realise or understand how great this change must be. Even railways have their memorials in the Abbey, for in the Nave we find the grave of Robert Stephenson, who died in 1859, engineer of the Birmingham Railway and of the Britannia Bridge over the Menai Straits. He is buried next to the famous engineer, Thomas Telford, who died in 1834, and whose chief works were the Caledonian Canal, the Menai Bridge, and the plan for the inland navigation of Sweden. There is a large statue of Telford in St. Andrew’s Chapel. Not far from the grave of Robert Stephenson is a window in his memory. It is not at all beautiful, as it represents railway bridges and other things which do not look well in a stained-glass window,—but it is certainly interesting. Near this are windows in memory of the great engineers (1) Richard Trevithick, who died in 1833, the inventor of the high-pressure steam-engine, and of the first real railway engine; (2) Brunel, who died in 1859, and who built the largest steamships known in his time, the _Great Eastern_ and the _Great Western_; and (3) John Locke, who died in 1860, and who designed the “Crewe Engine.”