MUSEUM OF COMPARATIVE ZOOLOGY. 53 
Suiphiiriovacid, (SS, O54). 6) saber RHR gar DAA 
PROP IEG oP Fa evetics! crs Cee Peer teeta 
Lames(Ca OQ) Weewstdinm 2S OO 
Marner (Moti t.) (Gad. a) oy O70 
Ipourauae baring s 42). oo 3 to PL 
inisoncnomesidte's Ts)". aka ss a, Mec, 10.21 
Tipea) Olay Te MIbO gre al o> shee Nsn in sels Sal 
99.70 
Oxygen corresponding to Fluorine . .—0.51 
99.19 
There were also traces of Silica and Chlorine. 
Atomic Ratios. 
iG Matinee 1 ih ee AM atta 5 
COs as aA vat Bite aed 
1814. 
Sh aa: deter er eatin | Genk ire At GO 
Fl RR aaa emo 64 
CaO) oe: cee Fa Mee ee B= Wh 1853 
\isss 
EONS a, ek egeire se. Le! aie! vege OD 
At the same place and depth there was a concretion of a brown color 
consisting of an aggregation of calcareous organisms cemented by a 
brownish yellow matter, often showing concentric rings after the man- 
ner of agate. This yellowish brown matter is isotropic, between crossed 
nicols only the calcite and the shells of the Foraminifera brighten up ; 
the calcite lies crystallized in the interior of the Foraminifera. In 
treating the brown or yellow parts under the microscope with molyb- 
date of ammonium and nitric acid, there is an abundant yellow precipi- 
tate characteristic of phosphoric acid. 
At other stations small phosphatic concretions were also obtained by 
the “ Blake,” all more or less resembling those described above. There 
are difficulties in understanding how phosphate of lime and carbonate of 
lime are deposited at the bottom of the sea, yet there is no doubt that 
such a deposition does take place under some special circumstances. 
Their solution is, however, an almost universal phenomenon in the 
ocean. 
Specimen 60, Line P’. — Lat. 24° 50’ N. Long. 84° 50’ 45” W. 15 May, 
1875. Depth, 2008 fathoms. A reddish brown Globigerina ooze dries into 
slightly coherent lumps. 
