After reviewing the existing proccdures for solving the three-body problem by convergent power series, theauthor develops two algebraic methods in terms of the independent variable which is either the time 1 or LEVI-CIVITA'S regularizing variable a.Thesc power series solve in\VEIERSTRASS' and PAINLEV~'S sense the problem formulated in itsgreatest generality, since no restrictions at all are made on the order of magnitude of masses and none of the three bodies is restricted to moving along a prescribed conic section. Rcsides, the reference system used is a tridimensional Cartesian one. I n the i-domain, the expressions for the high-order derivatives of the coordinates are computed using repeatedly LEIBNITZ'S rule for derivatives of products of functions. In the u-domain, a n extremely simple successive'approximation procedure is establishcd b y ineans ot a singlr recursion formula which requires elementary opcrations t o bc performed on polynomials of increasing degrees.
AnliiiBlich meiner photographischen Beobachtungen der Nova C P L a c e r t a e an der Koriigl. Sternwarte zu Catania habe ich ciiic neue Formel fur die Ableitung der SterngroBen aus den Durchmessern der Sternscheibchen, die auf der photographischen Platte gemessen wurden, anzuwenden versucht. UIm Ableitung und Anwendung dieser Formel sei hier kurz Iicrichtet.Eiiipirische Formeln, die bis jetzt fur das genannte Problem aiig-cwnndt wurden; sind:wo m t i i t . GroBenklasse und B der gemessene Durchmesser ist untl I I iind 6 fur jede Platte zu bestimmende Konstanten bezeicliiicm. I :c.i ckxr Herstellung des Astrographischen Kataloges werdcii I I ( 11.11 verschiedene photometrische Systeme der Reduktion tl1.1. ~)liotographischen Platten benutzt und ebenso ver-schiet1c.i 11' ( l4.r genannten Formeln angewendet. In Catanial) wird fii I. I I i i . %one +46"
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