I pitched badly twice in an upward rush--solely due to these diabolical throw-downs--that came near to wrecking my propeller. Equatorial work at low levels is trying enough in all conscience without the added terrors of scientific hooliganism in the Doldrums. Rhyl. J. VINCENT MATHEWS. [We entirely sympathize with Professor Mathews's views, but unluckily till the Board sees fit to further regulate the Southern areas in which scientific experiments may be conducted, we shall always be exposed to the risk which our correspondent describes. Unfortunately, a chimera bombinating in a vacuum is, nowadays, only too capable of producing secondary causes.--_Editor_.] Answers to Correspondents VIGILANS--The Laws of Auroral Derangements are still imperfectly understood. Any overheated motor may of course "seize" without warning; but so many complaints have reached us of accidents similar to yours while shooting the Aurora that we are inclined to believe with Lavalle that the upper strata of the Aurora Borealis are practically one big electric "leak," and that the paralysis of your engines was due to complete magnetization of all metallic parts. Low-flying planes often "glue up" when near the Magnetic Pole, and there is no reason in science why the same disability should not be experienced at higher levels when the Auroras are "delivering" strongly. INDIGNANT--On your own showing, you were not under control. That you could not hoist the necessary N. U. C. lights on approaching a traffic-lane because your electrics had short-circuited is a misfortune which might befall any one. The A. B. C., being responsible for the planet's traffic, cannot, however, make allowance for this kind of misfortune. A reference to the Code will show that you were fined on the lower scale. PLANISTON--(1) The Five Thousand Kilometre (overland) was won last year by L. V. Rautsch, R. M. Rautsch, his brother, in the same week pulling off the Ten Thousand (oversea). R. M.'s average worked out at a fraction over 500 kilometres per hour, thus constituting a record. (2) Theoretically, there is no limit to the lift of a dirigible. For commercial and practical purposes 15,000 tons is accepted as the most manageable. PATERFAMILIAS--None whatever. He is liable for direct damage both to your chimneys and any collateral damage caused by fall of bricks into garden, etc., etc. Bodily inconvenience and mental anguish may be included, but the average jury are not, as a rule, men of sentiment. If you can prove that his grapnel removed _any_ portion of your roof, you had better rest your case on decoverture of domicile (See Parkins _v_. Duboulay). We entirely sympathize with your position, but the night of the 14th was stormy and confused, and--you may have to anchor on a stranger's chimney yourself some night. _Verbum sap!_