188 Scientific Iiitelligence. — Metcfrrohgy. 



county of Kildare, a few days ago. At this time the tides were 

 remarkably high, and the sea exhibited marks of unusual dis- 

 turbance. I regret that I can send one only of these shells." 



9. Colours of' Lightning. — The colours of Hghtning that ac- 

 companies thunder high in the atmosphere, are yellowish white, 

 sometimes reddish, seldom pale green ; but in low thunder, the 

 lightning is bluish or pale violet. — Kastner. 



10. Meteoric Stones, — Earthy meteoric stones are com- 

 pact and grey coloured, and either contain, besides finely disse- 

 minated native iron, no other constituent parts, as in those of En- 

 sisheim, Aigle, Lissa, &c. ; or they are composed of diffe- 

 rent mineral substances, arranged in granular concretions, as 

 is the case with the meteoric stones of Stannern and Juvenas. 

 The meteoric stone of Juvenas, according to Mitscherlich, is a 

 granular, crumbly, compound of augite (which also occurs crys- 

 tallized in cavities of the mass), labradorite (Labrador fel- 

 spar), a yellow foliated mineral, and a metallic mineral, re- 

 sembling magnetic pyrites. The resemblance of this meteoric 

 stone to the greenstone (dolerite) of the Meissner Hill in Ger- 

 many, is very striking ; and not less so to some varieties of 

 greenstone from Hammersfiord in Iceland. That the white mi- 

 neral in the meteoric stone is not common felspar, is proved by 

 the re-entering angles formed by the cleavages in the twin- 

 crystals. 



CHEMISTRY. 



11. Effects of Mineral Substances on Animals. — From the 

 experiments of Professor Gmelin of Tubingen on the action of 

 mineral substances on animals, it results, 1 . That mineral sub- 

 stances, very nearly allied to each other, as baryte and stron- 

 tian, are yet very different in the effects they produce on the 

 animal body. S. That, of the different metals injected into the 

 vascular system, three only occasioned coagulation of the blood, 

 viz. muriates of barytes, uranium, aud palladium ; which three 

 metals differ very much in their chemical constitution. 3. That, 

 when chromate of potash is introduced, under the skin, in- 

 to the cellular substance, it affects the bropchial system, occa- 

 sioning increased secretion of mucus, and also inflammation of 



