xx CONTENTS. 



PAGE 



ELECTRO-CHEMICAL POLARITY OF GASES . . . .356 

 STRIDE IN THE ELECTRICAL DISCHARGE . . . 376, 379 

 ANOMALOUS CASES OF ELECTRICAL DECOMPOSITION . .384 

 ELECTRICITY OF THE BLOWPIPE FLAME . . . . 392 

 METHOD OF INCREASING EFFECTS OF INDUCED ELECTRICITY 396 

 APPARENT CONVERSION OF ELECTRICITY INTO MECHANICAL 



FORCE 400 



NEW METHODS OF PRODUCING AND FIXING ELECTRICAL 



FIGURES 402 



INFLUENCE OF LIGHT ON THE POLARISED ELECTRODE . . 406 

 TRANSMISSION OF ELECTROLYSIS ACROSS GLASS . . 415 

 EXPERIMENT IN MAGNETO-ELECTRIC INDUCTION . . .418 



SOME EFFECTS OF HEAT ON FLUIDS 419 



NEW CLASS OF APLANATIC TELESCOPES . . . .431 



MODE OF REVIVING DORMANT IMPRESSIONS ON THE RETINA 435 

 NATURAL PHOTOGRAPHY . . . . . . -436 



REFLEXION AND INFLEXION OF LIGHT BY INCANDESCENT 



SURFACES 437 



NOTES ON OCCULTATIONS OF JUPITER, 1856 AND 1857 . 442 



STAR ARCTURUS AND COMET, 1858 444 



OCCULTATION OF SATURN, 1859 445 



MARS WHEN NEAR THE EARTH, 1862 .... 446 



AURORA BOREALIS, 1870 446 



ARTIFICIAL ROCKING-STONES 449 



NOTES AND REFERENCES 453 



