It cannot be doubted that in a period much short of twenty years, railways will have penetrated from Berlin northwards to Russia; and therefore a communication of this kind through the whole of Europe, even to the shores of the Indian Ocean, will be among the ordinary things of the day. As for communication by electric telegraph, where will it not be? Every town of any importance, from Moscow to Madras, will be connected by the marvellous wires. These wires will cross seas; they will reach from London to New York, and from New York to far-western cities--possibly to California. The sending of messages thousands of miles, in the twinkling of an eye, will be an everyday affair. 'Send Dr So-and-so on by the next train,' will be the order despatched by a family in Calcutta, when requiring medical assistance from London; and accordingly the doctor will set off in his travels per express, from the Thames to the banks of the Ganges. Spanning the globe by thought will then be no longer a figure of speech--it will be a reality. Science will do it all. Long before twenty years--most likely in two or three--a journey round the world by steam may be achieved with comparative ease and at no great expense. Here is the way we shall go: London to Liverpool by rail; Liverpool to Chagres by steamer; Chagres to Panama by rail; Panama to Hong-Kong, touching at St Francisco; Hong-Kong to Sincapore, whence, if you have a fancy, you can diverge to Borneo, Australia, and New Zealand; Sincapore to Madras, Bombay, Aden, and Suez--the whole of the run to this point from Panama being done by steamer; Suez to Cairo, and Cairo to Alexandria (rail in preparation); lastly, by steamer from Alexandria to England. It is deeply interesting to watch the progress of intrusion on the Pacific. Already, within these few years, its placid surface has been tracked with steam-navigation; of which almost every day brings us accounts of the extension over that beautiful ocean. Long secluded, by difficulty of access from Europe, it is now in the course of being effectually opened up by the railway across the Isthmus of Panama. And the grandeur of this invasion by steam is beyond the reach of imagination. Thousands of islands, clothed in gorgeous yet delicate vegetation, and enjoying the finest climate, lie scattered like diamonds in a sea on which storms never rage--each in itself an earthly paradise. When these islands can be reached at a moderate outlay of time, money, and trouble, may we not expect to see them visited by the curious, and flourishing as seats of civilised existence? There is reason to believe, that the equable climate of many of them would prove suitable for persons affected with the complaints of northern regions; and therefore they may become the Sanatoria of Europe. 'Gone to winter-quarters in the Pacific!'--a pleasant notice this of a health-seeking trip twenty years hence.