Thanks are due to Mr. Raymond Archambault and Mr.

treal, for their help in the experimental part of this study. We also thank the "Programme d'aide financiere aux chercheur-es et createurstrices (PAFACC) de I'Universite du Quebec a Montreal " for their financial support. Journal of Heredity 1990;81:434-437;0022-1503/90/$2.00 Although the commercial raspberry is self-fertile, it may benefit from cross-pollina-tion. Comparisons were made to determine whether the commercial raspberry showed xenic tendencies in cross-pollination. The average weight of self-pollinated raspberry drupelets was compared to that of cross-pollinated drupelets. We also examined the correlation between the weight and number of fertilized ovules from both self-pol-linated and cross-pollinated berries. Four raspberry varieties—'Carnival, ' 'Festival,' 'Latham, ' and 'Muskoka'—were cross- and self-pollinated during 1986-87. Results indicate that a metaxenic phenomenon does occur in raspberries. In 1987, the freely cross-pollinated Festival had an average drupelet weight superior to that of self-pollinated control. We also noticed that the relation between raspberry weight and the number of drupelets were higher in Festival than in Muskoka. Commercial raspberry varieties are known to be self-fertile (Daubeny 1971; Keep 1968). However, many authors admit that self-pollination is variable in certain va-rieties (Daubeny 1969, 1971; Jennings 1967). Raspberry size depends, to a great extent, on the number of fertilized ovules or drupelets. For the Newburgh variety there is a strong correlation between the weight of the raspberries and the number of drupelets (de Oliveira et al. 1983a). Though the commercial raspberry is self-fertile, it is well suited to cross-pollination because the stigmata become receptive before all the anthers release pollen. The presence of pollinating insects increases yield by reducing the malformation rat