Bibliography. 149 
well-defined, round black spot, such as the one in question is de- 
scribed to have been, from the irregular, ill-defined, and lighter 
colored object which a solar spot, however minute, would pre- 
sent to the eye of the observer. 
P.S. Since the foregoing was in type, we have received a 
statement of the observations made at Cambridge observatory by 
Messrs. Bond, and at the Philadelphia High School Suary aeey 
by Professor Kendal 1. 
At Cambridge, where the i —— was lost, the contacts at the 
egress were as follows :— 
Sidereal time. Mean solar time, 
h. ae 
Internal contact, Pet ae ee, Ps 59 6 2 32 
External * - 9 12 45 6. 5 87 
_At Philadelphia, the following results were obtained. 
Sidereal time. Mean solar time. 
h. m. i Me #. 
1st male contact, ‘ 2 2% 285 Wl 21 44:27 
1st Inte do. 3 2 2 66 11 23 41:94 
2d aren do. ‘ 8 52-553 5 46 27-76 
2d External do. ‘ 8 56 258 5 49 57-69 
Art. XVII.—Bibliographical Notices. 
1. Narrative of the United States Exploring Expedition during the 
years 1838, 1839, 1840, 1841, 1842; by Cuartes Wixxkzs, U.S. N. 
Commander of the Expedition. 5 Vols. with an Atlas.—Philadelphia, 
1845, Lea & Blanchard.—These noble volumes are honorable alike to 
the country and the expedition whose history they relate. In style of 
execution, they have not been exceeded in this country, and the numer- 
ous engravings are by our best artists. The work abounds in strange 
incidents both by sea and land, which throw unusual life and interest 
into the valuable details of facts presented, regarding the features, 
productions and people of the various lands visited. 
The progress of the expedition during its absence, has been from time 
to time noticed in this Journal, and a connected outline of its course and 
results has been given since its return, in Volume XLIv, page 393. Be- 
sides the descriptions of men and manners, and a large amount of geo- 
graphical and statistical information, the volumes contain much that is 
of scientific interest, and especially so to the geologist. The fine illus- | 
trations and descriptions, of the island of Hawaii, lay open to the eye 
that vast region of volcanic action, and with their guidance and aid, the 
