300 Bibliography. 
The specimens were all sawn through the nucles by a fine saw and 
e cortex and interior separately examine f the 78 calculi, the 
composition of the nucleus was uric acid mainly in 32, urate of ammo- 
nia in 26, oxalate of lime in 7, phosphates in 7, foreign substances in 4, 
cystine 2. The bodies are composed of uric acid mainly in 34, urate 
of ammonia in 2, oxalate of lime in 16, mixed phosphates in 16, triple 
phosphates in 4, cystine in 2. 
The peculiarities presented by the Lexington collection, are a great 
deficiency in the proportion of pure uric acid in the nuclei, a great ex- 
cess in the proportion of nuclei containing urate of ammonia and the 
earthy phosphates found in their general composition, an excess in the 
proportion of the mulberry or oxalate of lime calculus. Only a very 
small proportion of the cases of calculi occurring in the vicinity of 
Lexington have been preserved. 
2. Coast Survey: Report of Prof. A. D. Bacns, Superintendent of 
the U. S. Coast Survey, showing the progress of that work for the 
ing activity from the reconnaissance forward, until all the objects of the 
maps. The style of these maps is in all respects admirable, as all 
__ The hydrographical party under Lt. Commanding Davis, made the 
Important discovery, during the past season, of an extensive shoal 
the eastern end of Nantucket lying directly in the track of communi- 
cation to and from Europe, and upon which, not improbably, the ill-fated 
“President” steamer stranded. This dangerous shoal has hitherto been 
quite unknown, except to the lost. aeRO 
~ A melancholy interest is given to this Report by the loss of Lieuten- 
ant anding George M. Bache, and ten seamen from the survey- 
