264 Correspondence of J. Nickles. 
construction of which branch of science he had had so large a patt. 
work is now in press and will soon be published. The avails of 
its publication are the only dowry which the unfortunate Laurent left 
to his widow and children, his long sickness having absorbed all his re- 
es. As an addition to this, the French savants, headed by MM. 
r. 
Lavallé, the Central School of Arts and Manufactures, which has pro- 
duced all the distinguished engineers of the country, and which is now 
attended by students from all parts of Europe. 
Olivier was an able Professor. His language, clear, precise and ele- 
gant, fitted him for public instruction. A chair of Descriptive Geom- 
etry was created for him at the Conservatoire des Arts et Métiers, and 
he filled it with distinction till the time of his death. For illustration 
models, made with most admirable care, precision and economy. 
Besides this collection, there is another likéwise made by Olivier, illus- 
trating the movements of cog-wheels, either as employed in the Indus- 
trial Arts, or as interesting simply in a mathematical point of view 2 
the transmission of motion. 
In he published an important memoir on White’s theory of 
cog-wheels without friction from sliding. He afterwards occupied 
de munition”) was more healthy and more nutritious than white bread. 
mmeni 
opinion is now sustained by Chevreul, who declared his views 9? the 
