. Memoirs of the American Academy of Arts and Sciences. the wedge falls off rapidlybeyond X = , the photographic image becoming entirely invisible where X = H and K lines cannot be detected in this spectrum, although readily seen inthe other images. The opacity of the wedge increases rapidly as the wave-lengthdiminishes, as shown by the bolometer. A second photograph was taken of thelight transmitted at the point marked inches, and confirmed the above exposure lasted for nearly an entire day, and the brightest part was aboutequal to a spectrum obtained in 10 second
. Memoirs of the American Academy of Arts and Sciences. the wedge falls off rapidlybeyond X = , the photographic image becoming entirely invisible where X = H and K lines cannot be detected in this spectrum, although readily seen inthe other images. The opacity of the wedge increases rapidly as the wave-lengthdiminishes, as shown by the bolometer. A second photograph was taken of thelight transmitted at the point marked inches, and confirmed the above exposure lasted for nearly an entire day, and the brightest part was aboutequal to a spectrum obtained in 10 seconds without the wedge. As before, theH and K lines were invisible. In conclusion, the Uranometria Oxoniensis shows that valuable results may beobtained with the wedge photometer in skilful hands. But the experiments describedabove show sources of error which must be carefully studied before we can safelyapply it to stars of different colors, or to detecting small systematic errors in starcatalogues. MEMOIRS OF THE AMERICAN ACADEMY OF ARTS AND CENTENNIAL V 0 L IT I\[ E. Vol. XL—Part VI. —No. VII. CAMBRinOE:JOHN WILSON AND SON. ainibcrsitg I^ O T E. VII. Memoir nf Dmnil Irrnrhiwll The American Academy of Arts and Sciencesdistrihdes its quarto publications as often as separate mono-graphs are printed. There has- been some confusion in thedesignations and numbers on the covers of the several partsof Vol. XL, noil! completed; hid the page numbers arecorrect, and these alone should be followed in binding. V, 1791, in Ipswicli, one of^Y, Captain Jabez Treadwell,st settlers of the town, Avfiond. His mother, Elizabeth)svvich and Priscilla Kakei%s, — a gentleman, saysIliain in Essex, 1854 is the following My father and all his ]iii d. , , ^us to tjie first si(ilii-were farmers,—hard-working andrespectable men, none of wiiom have left any distinguishing mark either of their virtues orrices upon the community in wliicli they lived. My motlier, Eliza
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