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abdomen American Ammonoids aperture apex appears base become beginning broad cell changes characteristics characters close coiled complete contact furrow cross vein described diameter discal cell distinct dorsal furrow dorsum electrical ephebic stage existence fact femora figured fossil genera genus gerontic give given growth half impressed zone increase known lateral legs length less lines living chamber lobes longer longitudinal vein magnet marginal marked metanepionic middle nature Nautilus neanic nearly observed occurs origin outline paranepionic period plates position posterior cell present probably saddles says seen shell shown shows side similar siphuncle slight Society species specimen stage straight structure substage sutures third tibiæ tion Tipula true umbilical perforation venter ventral volution whorl wing young
Seite 111 - Spirits, at the same time, are to be fired by a spark sent from side to side through the river without any other conductor than the water ; an experiment which we some time since performed to the amazement of many.
Seite 111 - Make a small cross of two light strips of cedar, the arms so long as to reach to the four corners of a large thin silk handkerchief when extended ; tie the corners of the handkerchief to the extremities of the cross, so you have the body of a kite ; which, being properly accommodated with a tail, loop, and string, will rise in the air, like those made of paper; but this being of silk is fitter to bear the wet and wind of a thundergust without tearing.
Seite 111 - Collinson, Fellow of the Royal Society of London, a present of a glass tube, with some account of the use of it in making such experiments.
Seite 113 - While you, Great George, for safety hunt, And sharp conductors change for blunt, The empire's out of joint. Franklin a wiser course pursues, And all your thunder fearless views By keeping to the point.
Seite 113 - I have never entered into any controversy in defence of my philosophical opinions; I leave them to take their chance in the world. If they are right, truth and experience will support them ; if wrong, they ought to be refuted and rejected.
Seite 242 - Report of the Chief Signal Officer to the Secretary of War for the year ending June 30, 1871.
Seite 113 - The king's changing his pointed conductors for blunt ones is, therefore, a matter of small importance to me. If I had a wish about it, it would be that he had rejected them altogether as ineffectual. For it is only since he thought himself and family safe from the thunder of heaven that he dared to use his own thunder in destroying his innocent subjects...
Seite 111 - Tis true the sphere does not turn so swift as when the great wheel is used ; but swiftness we think of little importance, since a few turns will charge the vial sufficiently.