He writes in the same strain and for the same object to Professor Yandell, of Kentucky, adding: "In this respect the State of Kentucky is one of the most important of the Union, not only on account of the many rivers which pass through its territory, but also because it is one of the few States the fishes of which have been described by former observers, especially by Rafinesque in his "Ichthyologia Ohioensis," so that a special knowledge of all his original types is a matter of primary importance for any one who would compare the fishes of the different rivers of the West. . .Do you know whether there is anything left of Rafinesque's collection of fishes in Lexington, and if so, whether the specimens are labeled, as it would be very important to identify his species from his own collection and his own labels? I never regretted more than now that circumstances have not yet allowed me to visit your State and make a stay in Louisville." In 1854 Agassiz moved to a larger house, built for him by the college. Though very simple, it was on a liberal scale with respect to space; partly in order to accommodate his library, consisting of several thousand volumes, now for the first time collected and arranged in one room. He became very fond of this Cambridge home, where, with few absences, he spent the remainder of his life. The architect, Mr. Henry Greenough, was his personal friend, and from the beginning the house adapted itself with a kindly readiness to whatever plans developed under its roof. As will be seen, these were not few, and were sometimes of considerable moment. For his work also the house was extremely convenient. His habits in this respect were, however, singularly independent of place and circumstance. Unlike most studious men, he had no fixed spot in the house for writing. Although the library, with the usual outfit of well-filled shelves, maps, large tables, etc., held his materials, he brought what he needed for the evening by preference to the drawing-room, and there, with his paper on his knee, and his books for reference on a chair beside him, he wrote and read as busily as if he were quite alone. Sometimes when dancing and music were going on among the young people of the family and their guests, he drew a little table into the corner of the room, and continued his occupations as undisturbed and engrossed as if he had been in complete solitude,--only looking up from time to time with a pleased smile or an apt remark, which showed that he did not lose but rather enjoyed what was going on about him.