384 MK. E. WETHEEED ON THE DEVONIAN 



contain numerous liquid inclusions, and in some instances the 

 microlitic needles referred to in my account of the last slide. 



Residues from the Coral Limestone consist (1) of a black sub- 

 stance of low specific gravity, suggestive of carbon ; (2) a very 

 fine, light brown material ; (3) mineral grains which rapidly 

 subsided in the boiling flask. 



A portion of No. 1 was dried and ignited in a platinum crucible ; 

 the result was that it disappeared. This is confirmatory evidence 

 that the substance is carbon, and is further supported by the 

 occurrence of some few bodies, measuring 0*1 mm. in diameter, 

 which I have no doubt are the carbonized spores of plants. 



The second portion of the residue (2) is a micaceous, siliceous 

 paste in which are small crystals of zircon and great numbers of the 

 microlitic needles. In PI. IX. fig. 4, I have represented the paste 

 and microlitic needles. 



The heavier residue (3) contains a few fragments of tourmaline, 

 quartz, mica, and pyrites ; the quartz-fragments vary from 0*1 to 

 0*2 mm. in longest diameter, and are mostly in the form of 

 grains or crystals. Some of the micas appear to be decomposing ; 

 they contain numerous liquid inclusions, and in some instances 

 microlitic needles. 



The residue from the Calceola Beds consists of schistose material, 

 which is obtained in flakes or masses 1 centimetre in diameter. 

 There is also a very fine residue resulting from the breaking 

 up of the schistose flakes, and this is crowded with microlitic 

 needles. 



(b) Daddy Hole Limestone Residues.- — Specimen No. 1 was from 

 a bed near the base of the quarry, to which reference was made when 

 describing the thin sections of the Daddy Hole Limestones. The 

 very fine portion of the residue is dark in colour, and consists of a 

 micaceous siliceous paste. The dark colour is imparted by the 

 minute microlitic needles. The heavier portion includes siliceous 

 substances and micas, some of which are full of inclusions. 



No. 2. This is made up (1) of a fine groundmass or paste, and 

 (2) of material of higher specific gravity. The latter includes grains 

 of quartz, mica, and some other mineral fragments. A further 

 residue was taken from a bed near the top of the quarry. This is 

 made up of mica, quartz, and numerous fragments of what appear 

 to be decomposed mineral substances ; and some of these are appa- 

 rently micas. 



(c) Lummaton Limestone Residues. — No. 1 is a micaceous sili- 

 ceous paste crowded with microlitic needles ; there are also in it 

 very small crystals of zircon, and -some others not determined. 



The heavier portion of this residue is made up chiefly of mica and 

 siliceous substances, many of them crowded with the minute micro- 

 litic needles. 



No. 2. The heavier portion contains micro-crystals of quartz 

 similar to those represented in PI. IX. figs. 1,2, & 5, and these contain 

 numerous liquid inclusions. 



The finer portion is a siliceous paste. 



