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MR. J. C. MALET ON A CLASS OF INVARIANTS. 
As an example, let the solutions be related by the equations 
y^y%—yi^yi 
then transforming so that y l shall be we find 
J 1 = a constant, J 3 = a constant, J 3 = a constant; 
and in this case the complete solution is 
where 
2/=Aj© i<ic +Ce’ 1 J© l ‘ !x 
h—mnp 
dx 
