MAURY, MATTHEW FONTAINE MAZZARA DEL VALLO MAUSOLEUM MAZZINI, GIUSEPPE MAUSOLUS MAZZONI, GIACOMO MAUVE, ANTON MAZZONI, GUIDO MAVROCORDATO MEAD, LARKIN GOLDSMITH MAWKMAI MEAD, RICHARD MAXENTIUS, MARCUS VALERIUS MEAD MAXIM, SIR HIRAM STEVENS MEADE, GEORGE GORDON MAXIMA AND MINIMA MEADE, WILLIAM MAXIMIANUS MEADVILLE MAXIMIANUS, MARCUS VALERIUS MEAGHER, THOMAS FRANCIS MAXIMILIAN I. (elector of Bavaria) MEAL MAXIMILIAN I. (king of Bavaria) MEALIE MAXIMILIAN II. (king of Bavaria) MEAN MAXIMILIAN I. (Roman emperor) MEASLES MAXIMILIAN II. (Roman emperor) MEAT MAXIMILIAN (emperor of Mexico) MEATH MAXIMINUS, GAIUS JULIUS VERUS MEAUX MAXIMINUS, GALERIUS VALERIUS MECCA MAXIMS, LEGAL MECHANICS MAXIMUS MECHANICVILLE MAXIMUS, ST MECHITHARISTS MAXIMUS OF SMYRNA MECKLENBURG MAXIMUS OF TYRE MATTER. Our conceptions of the nature and structure of matter have been profoundly influenced in recent years by investigations on the Conduction of Electricity through Gases (see CONDUCTION, ELECTRIC) and on Radio-activity (q.v.). These researches and the ideas which they have suggested have already thrown much light on some of the most fundamental questions connected with matter; they have, too, furnished us with far more powerful methods for investigating many problems connected with the structure of matter than those hitherto available. There is thus every reason to believe that our knowledge of the structure of matter will soon become far more precise and complete than it is at present, for now we have the means of settling by testing directly many points which are still doubtful, but which formerly seemed far beyond the reach of experiment.