1901-2.] Dr Muir on the Theory of Jacobians. 
195 
Lagrange.* Then come the final words, “Et haec formula egregie 
analogiam differ entialis et Determinantis functionalis declarat,” — 
a not inappropriate ending in view of the author’s attitude through- 
out the memoir. 
* The memoirs referred to seem to be — 
Euler, L. — De formulis integralibus duplicatis. . . . Nov. Comm. Acad.. 
Petrop. (1769), xiv. i. pp. 72-103. 
Lagrange, J. L. — Sur l’attraction des spheroides elliptiques. Nouv. 
Mem. Acad. . . . Berlin (1773), pp. 121-148 ; or CEuvres, iii. pp. 
619-658. 
Equally worthy of note is one of date December 1839, but not published 
till 1840, viz. — 
Catalan, E. — Sur la transformation des variables dans les integrales 
multiples. Mem. couronnes par V Acad, de Bruxelles , xiv. (2) pp.. 
1-47. 
( Issued separately June 9, 1902.) 
