424 



ANNUAL OF SCIENTIFIC DISCOVERY. 



Oxide of cerium in New Jersey, 293 



Oxygen, influence of the solar ray on, 249 

 " magnetic, 133 



Ozone, 245 



" atomic weight of, 

 " connection of, with diseases, 

 " influence of, 245 



Pacific, exploration of the coast of, 



" origin of the general features of, 254 



Paddle-wheels perpendicular and radial, 14 



PAGE, PROF., 104, 129 



PAGET. PROF., 220 



PAINE, H. M., 33 



Paint, mineral, new, 73 



Paints, zinc, manufacture of, in New 

 Jersey, 173 



Palms, occurrence of, in the coal forma- 

 tion, 315 



PALTRINERI, M., 



Pancreas; functions of, 



Paper and parchment, causes and pre- 

 vention of mildew in, 



Parallax of Groombridge 1,830, 



Parasites and their relations to other 

 animals, 



Parasitic life, 



PARAVEY, M. DE, 



PARET, DANIEL, 



Parthenope, 



Passage, Northwest, existence of, 



Patterns, different, looms for weaving. 



Pavement, Roman, chemical analysis of, 



PAXTON, MR., 



Pearl fisheries, California, 



Peat-charcoal, power of, to remove col- 

 oring matters, 

 discoveries in relation to, 



Peculiarities of the African crania, 



PEIRCE, PROF., 



Pelorosaurus, 



Pens, gold, manufacture of, 



Percussion, effect of, on iron, 



Percussion-cap machines, 



PERCY, DR., 



Periodic meteors in 1849, 

 " in 1850, 



PERLEY, MR.. 253, 



PETER, DR. ROBERT, 



PETIT, M., 



PETRIE, MR., 



Petrifaction, 



Phosphate of lime in New Jersey, 

 " in New York, 



Phosphorescence of the sea. 



Phosphorus, diseases incident to the 



use of, 

 in copper, 



Photography, improvements in, 

 on glass, 



Physics of the Mississippi River, 



Physiology of generation, 



picture polariscope, 



Pigment, arseniate of copperas, 



Pipes and hose, coupling for, 



" stone-ware, improvement in, 



Pirsson's fresh-water condenser, 



Planets discovered in 1850, 

 " reflecting power of, 



PLANT, MR., 



Plant, soar>. C.ili.fbniia, 



334 



230 

 375 



340 

 342 

 327 

 211 

 361 

 267 

 41 

 214 

 102 

 331 



206 

 205 

 357 

 375 

 310 

 67 

 22 

 43 

 224 

 371 

 371 

 254 

 230 

 372 

 110 

 272 

 303 

 304 

 334 



331 



224 



150 



149 



25G 



343 



146 



212 



60 



55 



9 



364 



110 



91 



323 



Plants, algous, atmospheric dissemina- 

 tion of, 324 

 " analogy between the modes of 

 reproduction in, and the al- 

 ternation of generation in Ra- 

 . diata, 333 

 ' fresh-water, iodine in, 180 

 " growth of, in abnormal atmos- 



i on 



pheres, o2o 

 " influence of animal charcoal in 

 removing the active principles 

 of, from their solutions in 



water, 196 



" mode of preserving, 327 

 " part performed by manures in 



the nourishment of, 202 



Plaster casts, bronzing, 74 

 of Paris, method of hardening 



objects in, 74 '. 



Platinum in California, 293 



in the Alps, 



PLAYFAIR, DR., 224 



Plough, steam, 37 



POGGAILE, M., 192 



Poison, woorara, 321 

 Polariscope and reflecting goniometer, 



combination of, 142 



Polarized light, effect of water on, 140 



Pollux, brightness of, 377 



PO?.IEROY, E. G., 97 



Porcelain, method of gilding, 72 



Porpoise, American, 337 



POST, NATHAN, 29 



Potash, green-sand as a source of, 203 



Potato disease, cause of, 326 

 Potatoes, means of checking disease 



in, 199 



POURTALES, MR , 323 



Powerful magnets, 135 

 Preparation of a mineral blue color used 



by the ancients, 213 



of flax, improvements in, 76 

 Presence of chloroform in the human 



body, test for, 216 

 of fluorine in blood, milk, and 



sea-water, 183 

 of sugar in certain liquids, 



new test for the detection of, 187 



Preserving plants and flowers, mode of, 327 

 Press, anti-friction, 



'' cotton, 34 

 Pressure, effect of, in lowering the freez- 

 ing point of water, 156 

 hydraulic, in coal mines, 31 

 Prevention of dust and smoke on rail- 

 ways, 27 

 of mildew in paper and 



parchment, 230 

 Principles, active, of plants, influence 

 of animal charcoal in re- 

 moving from their solu- 

 tions in water, 193 

 " geometrical, of beauty, 165 

 Printers' ink, 72 

 Printing machine for the blind, 33 

 " " new, 32 

 press, cylindrical rotary, 31 

 Production of ice, artificial, 57 

 of light and heat, improve- 

 ments in, 81 



