SCIENTIFIC SUMMARY. 
42 & 
SiO 2 
Pole’s Hair 
50*75 
A10 2 
16*54 
FeO 2 
2*10 
FeO 
7*88 
MnO 
trace 
MgO 
7*65 
OaO 
11*96 
Na 2 0 
2*13 
K 2 0 
0*56 
ign. 
0*35 
Total . 
. 99*92 
West Rock “ Trap ” 
51*80 
14*21 
3*55 
8*26 
0*42 
7*63 
10*68 
2*15 
0.39 
0*63 
99*72 + P0 5 014. 
This u trap ” consists of lalbradorite and augite, with some magnetite, and 
the perfect fusibility of such a compound is well indicated by the facts 
observed at Kilauea. There is hence no question as to the complete fusion 
of such ingredients in a volcano, even where no moisture is present. “ The 
analyses,” says Professor Dana, u add another to the many examples already 
known, proving that there was no difference in constitution between a large 
part of the material in fusion rejected in mesozoic time, and that thrown 
out by modern volcanoes ; and it illustrates the fact that geology has no 
good basis for the distinction of ‘ older’ and { younger ’ among igneous 
rocks.” 
According to O. F. W. Krukenberg, the fibres of Pelffs hair are often 
tubular, and sometimes bent and formed into loops ; they frequently con- 
tain air-bubbles, and occasionally microlites. They are usually enlarged 
where they contain crystals (or microlites), and also about many of the air- 
cavities. — ( Sillimctri’s Journal , August, 1879.) 
Palceozoic Plants. — Count Gaston de Saporta notices certain organisms of 
Lower Silurian age, the nature of which has hitherto been very doubtful, 
as they have been regarded by different observers sometimes as vegetable 
impressions, sometimes as casts of the tracks of annelides or other animals. 
Three types are especially referred to by M. de Saporta, namely, Tigillites , 
Bilobites or Cruziana, and the Scandinavian Eophyton. Tigillites are regarded 
by him as representing the tubes of arenicolous annelides. They are cylin- 
drical bodies associated in colonies, placed vertically in the rocks, and filled 
in after the death of the inhabitant. In appearance and dimensions, in the 
presence of obscure zones of growth still visible on the surface, in the mode 
in which they terminate below, and, in fact, in all their characters, they re- 
semble the Spirographis now living on the shores of the Mediterranean. 
Bilobites or Cruziana is regarded as a marine vegetable organism, although 
nothing analogous to it exists among the Algae of the present day. M. de 
Saporta adduces, in support of the vegetable nature of these fossils, a pecu- 
liarity in their mode of fossilization. They are found in half-relief upon the 
lower surface of the beds in which they are preserved, and are always repre- 
sented by a hollow impression on the upper surface of the subjacent beds. 
This half-relief, showing all the details of the external organization of the 
ancient plants, is the result of the imbedding of a fleshy or cartilaginous 
body which, after moulding itself in the sediment, has disappeared by de- 
