134 ;  -MALUS. 
arrangement made between General Ménou, 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 
seenes of Jaffa, of Damietta, and Lesbiéh, he must have 
found the lazaretto in which he was now confined a 
- place of luxury. As soon as he was 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 Wilhelmine Louise Koch, affianced to 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 dep6t 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 having horizontal sails disposed in 
Se a 
