Statement of Significance (as of designation - September 25, 1997):
The Day house, architecturally a wonderful example of Victorian ecelecticism, is important for its association with amateur geologist Dr. Fisk Holbrook Day. Day and other naturalists of his time unselfishly assembled large collections of natural history specimens, made detailed observations on a local scale, then passed them along to professional scientists who examined them and decipherred their significance on the national level. In such a manner, the Dr. Days of their time played key roles in the progress of 19th century American science. Dr. Day's particular contribution was a large and outstanding collection of Silurian fossils, which now forms an important part of the paleontology collection in the Museum of Comparative Zoology at Harvard University.