The human, as apart from the scientific, side (developed in his own volumes) of his epoch-making discoveries is marked with a simplicity, clarity, and good sense beyond praise. I would specially refer such as doubt the sustaining influence of ancestral faith upon character and will to the eleventh and nineteenth chapters, in which are contained the opening and consummation of the Tellurionical Records extending over nine years. Of their tremendous significance be sure that the modest house at Meudon knew as little as that the Records would one day be the world's standard in all official meteorology. It was enough for them that their Xavier--this son, this father, this husband--ascended periodically to commune with powers, it might be angelic, beyond their comprehension, and that they united daily in prayers for his safety. "Pray for me," he says upon the eve of each of his excursions, and returning, with an equal simplicity, he renders thanks "after supper in the little room where he kept his barometers." To the last Lavalle was a Catholic of the old school, accepting--he who had looked into the very heart of the lightnings--the dogmas of papal infallibility, of absolution, of confession--of relics great and small. Marvellous--enviable contradiction! The completion of the Tellurionical Records closed what Lavalle himself was pleased to call the theoretical side of his labours--labours from which the youngest and least impressionable planeur might well have shrunk. He had traced through cold and heat, across the deeps of the oceans, with instruments of his own invention, over the inhospitable heart of the polar ice and the sterile visage of the deserts, league by league, patiently, unweariedly, remorselessly, from their ever-shifting cradle under the magnetic pole to their exalted death-bed in the utmost ether of the upper atmosphere--each one of the Isoconical Tellurions--Lavalle's Curves, as we call them to-day. He had disentangled the nodes of their intersections, assigning to each its regulated period of flux and reflux. Thus equipped, he summons Herrera and Tinsley, his pupils, to the final demonstration as calmly as though he were ordering his flighter for some midday journey to Marseilles. "I have proved my thesis," he writes. "It remains now only that you should witness the proof. We go to Manila to-morrow. A cyclone will form off the Pescadores S. 17 E. in four days, and will reach its maximum intensity in twenty-seven hours after inception. It is there I will show you the Truth." A letter heretofore unpublished from Herrera to Madame Lavalle tells us how the Master's prophecy was verified. (_To be continued_.) ADVERTISING SECTION MISCELLANEOUS WANTS Required immediately, for East Africa, a thoroughly competent Plane and Dirigible Driver, acquainted with Petrol Radium and Helium motors and generators. Low-level work only, but must understand heavy-weight digs.