  Among 12672 Feynman diagrams contributing to the electron anomalous magnetic
moment at the tenth order, 6354 are the diagrams having no lepton loops, i.e.,
those of quenched type. Because the renormalization structure of these diagrams
is very complicated, some automation scheme is inevitable to calculate them. We
developed an algorithm to write down FORTRAN programs for numerical evaluation
of these diagrams, where the necessary counterterms to subtract out ultraviolet
subdivergence are generated according to Zimmermann's forest formula. Thus far
we have evaluated crudely integrals of 2232 tenth-order vertex diagrams which
require vertex renormalization only. Remaining 4122 diagrams, which have
ultraviolet-divergent self-energy subdiagrams and infrared-divergent
subdiagrams, are being evaluated by giving small mass lambda to photons to
control the infrared problem.
