Admiral Tucker possessed many of the qualities of a great commander. His judgment was excellent, and it was very rarely the case that he was mistaken as to what it was possible for the force at his disposal to accomplish. He always commanded the respect and confidence, as well as the good will, of his men. A strict disciplinarian, the prompt and unhesitating obedience to orders he exacted was cheerfully rendered by his subordinates. His plans were coolly and deliberately formed, and, having been once determined upon, were carried out with energy and resolution. In the ordinary intercourse of private life he was so gentle, generous and genial that his friends and associates felt for him a regard approaching affection. In youth he was an eminently handsome man and in maturer years his presence was imposing. Sailors and Indians are fond of giving personally descriptive names to those with whom they are thrown in contact; when Tucker was a lieutenant he was called "Handsome Jack" by the men-before-the-mast, and the warriors of the savage tribes that wander about the head waters of the Amazon knew him as the "Apo," the meaning of the word being "High Chief." In concluding this sketch of the eventful life of John Randolph Tucker, it is but doing justice to his memory to say that the sea-service never produced a more thorough and accomplished sailor, and that there never was bred to the profession of arms a more honorable and gallant gentleman. * * * * * [Illustration: JAMES HENRY ROCHELLE] NOTES ON THE Navigation of the Upper Amazon AND ITS PRINCIPAL TRIBUTARIES BY CAPTAIN JAMES HENRY ROCHELLE Member of the late Peruvian Hydrographical Commission of the Amazon. NOTES. THE AMAZON. Springing from Lake Laracocha, in the heart of the Andes, the Amazon winds its way through the eastern Cordillera of Peru, a rapid and turbulent stream, until, passing through a narrow gorge in the mountains at the pongo de Manseriche, it leaps into the lowlands and flows for two thousand six hundred and sixty miles in a direction nearly east through the vast plains of Peru and Brazil, fed on its way by tributaries which are themselves great rivers, and finally pouring its immense volume of water into the Atlantic ocean. From the Atlantic up to the Peruvian frontier the river is known as the Lower or Brazilian Amazon, and sometimes as the Solimoens; above the Brazilian frontier the river lies wholly in Peruvian territory and takes the name of the Peruvian Amazon or Maranon, but is commonly spoken of as the Upper Amazon. It is of the navigation of the Upper Amazon that these notes will treat. RISE AND FALL OF THE RIVER.