134 MALtJS. 



arrangement made between General ISIenou, Comman- 

 der-in-Chief of our army, and the hostile generals. He 

 arrived at Marseilles the 1st October, 1801, and was 

 immediately put into quarantine. After the pestiferous 

 scenes of Jaffii, of Damietta, and Lesbieh, he must have 

 found the lazaretto in which he was now confined a 

 place of luxury. As soon as he w^as set at liberty he 

 repaired to Paris. After a short visit to his relations, 

 bound by his sentiments even more than by his promise, 

 he hastened to Giessen, where he once more joined 

 Mademoiselle Wilhelraine Louise Koch, affianced tp him 

 for four years, and was married to her. This union 

 completed his happiness ; we shall soon have to relate 

 the rare proof of devotion which Madame Malus gave 

 the husband of her choice during the afflicting illness 

 which took him from her and from the sciences. 



The subsequent military career of Malus may be 

 stated in a few lines. In 1802-3 he was employed at 

 Lille. We find him in 1804 at Antwerp, planning 

 measures, according to the orders of Napoleon, for 

 completing the naval establishment of the city, and ex- 

 tending its lines of fortification. In this elaborate work, 

 the account of which is preserved in the depot of fortifi- 

 cations, accompanied by eleven sheets of drawings, the 

 author treats analytically, but without neglecting the 

 arithmetical applications, two questions of mechanics, 

 which, under the circumstances and in that locality, pos- 

 sess a great importance, viz : 1. The amount which, 

 ought to be deducted for the weight of men marching in 

 a tread-wheel, to move the inclined twisted pipes, or 

 Archimedean hydraulic screws, used in draining : 2. The 

 employment, for the same purpose, of the force of wind, 

 acting on wind-mills luiving horizontal sails disposed in 



