PLATE XXIII. 
Fig. 1. Magnetic spherule of cosmic origin from Station 285; 2375 fathoms, South Pacific. This spherule 
was extracted from a manganese nodule, and has a coating of black magnetic iron, with a brilliant 
and shagreoned surface (magnified 90 diameters). 
Fig. 2. Magnetic spherule from Station 276 ; 2350 fathoms. South Pacific. It is regular in form, but has not a 
central nucleus. The figure shows a broken surface, which is blue-black, with a dull aspect. The 
structure presents many somewhat regular cleavages. Although presenting some of the characters 
of chondrcs of bronzite, somewhat like that shown in fig. 11, the origin of this spherule must be 
regarded as doubtful (magnified 90 diameters). 
Fig. 3. Spherule composed of crystals of phillipsite from Station 276 ; 2350 fathoms. South Pacific. The 
crystals are terminated by the faces of domes or pyramids. This shows the external aspect of the 
spherules seen in section in Plate XXII. figs. 2 and 3 (magnified 90 diameters). 
Fig. 4. Cosmic magnetic spherule from Station 285; 2375 fathoms. South Pacific. The external aspect of 
this spherule is similar to that shoAvn in fig. 1, but the figure exhibits the characteristic cupule 
present in nearly all these cosmic sj^herules (magnified 90 diameters). 
Fig. 5. Cosmic magnetic spherule from interior of nodule from Station 276; 2350 fathoms. South Pacific. 
A part of the external layer has been removed to show the grey metallic nucleus of native iron 
(magnified 90 diameters). 
Fig. 6. Cosmic magnetic spherule from Station 276; 2350 fathoms. South Pacific, embedded in a mass of 
little crystals of zeolites (magnified 90 diameters). . 
Fig. 7. Metallic nucleus of a cosmic spherule from the same station. This nucleus has a grey metallic lustre ; 
it has taken a discoidal form under pressure in an agate mortar. When placed in an acid solution 
of sulphate of copper, no copper was precipitated, and it is probably an aUoy of iron, nickel, and 
cobalt (magnified 90 diameters). 
Fig. 8. Cosmic spherule from Station 285; 2375 fathoms. South Pacific, a portion of the crust having been 
removed to show the metallic nucleus (magnified 90 diameters). 
Fig. 9. Metallic nucleus of cosmic spherule from Station 276; 2350 fathoms. South Pacific. The black coating 
has been removed, and the particle has assumed a discoidal appearance under pressure in an agate 
mortar. "VMien placed in an acid solution of sulphate of copper, the copper w'as at once precipitated 
over the whole surface, which indicates that the nucleus was composed of native iron (magnified 
90 diameters). 
Fig. 10. {See fig. 13.) 
Fig. 11. Chondre from Globigerina Ooze, Station 338; 1990 fathoms. South Atlantic. This chondre is about 
1 mm. in diameter. In reflected light under the microscope it has a bronze metalloid reflection. 
It is formed by the juxtaposition of a great number of lamellm, which start from an excentric 
jwint, where there is a depression in the form of a cupule. The characters are quite analogous tc' 
those of chondres of meteorites (magnified 37 diameters). 
Figs. 13 and 10. Microstructure of one of the lamellm of the chondre represented in fig. 11. These are formed 
of an accumulation of little colourless prisms, about 0'05 mm. in diameter. The prisms follow 
two directions, cutting each other at an angle of 70°. The lamellae have many dark-coloured 
inclusions in the form of crystallites, which are probably magnetite, arranged regularly following 
the direction of the little prisms (magnified 390 diameters). 
Fig. 12. Appearance of the magnetic particles extracted from Iladiolarian Ooze, Station 274; 2760 fathom.s. 
Mid I ’aeific, afU*r being broken down in an agate mortar, and treated with an acid solution of 
sulphate of coj>per. The black particles are fragments of magnetite and coatings of the cosmic 
spherules, while those on which copper has been deposited are malleable particles of native iron 
(magnified 37 diameters). 
