And it would appear from information given me by Mr. Watson, Dr. Asa Gray, and Mr. Wollaston, that generally, when varieties intermediate between two other forms occur, they are much rarer numerically than the forms which they connect.
Arau honen adibide nabariak topatu ditut Balanus generoko aldaki ongi markatuen bitarteko aldakien kasuan, eta Watson, Asa Gray eta Wollastonek eman didaten informaziotik argi legoke, forma biren bitarteko aldakiak agertzen direnean, elkarlotzen dituzten formak baino askoz urriagoak direla eskuarki.