Derselbe wurde sachgemäss auf eine kleinere Pflanzengruppe beschränkt und ist nun nach Verlauf von acht Jahren im Wesentlichen abgeschlossen.
This experiment was appropriately confined to a smaller plant-group and has now been essentially concluded after the passage of eight years.
appropriately = sachgemäss Bateson has “practically”, Sherwood formulates “It was expedient to […]”. The term Mendel chooses here is interesting, since sachgemäss does not only imply expedience, but also following procedures appropriate to a project or task at hand. We therefore follow Druery's initial suggestion.