An Interaction Task in Virtual Reality is such that a user can modify a computer generated virtual world using various techniques. But current interaction techniques cannot be applicable for most virtual environments due to their inefficiency and inconvenience. In this paper, we propose a selection and manipulation technique called the Finger-gesture. We evaluate its usefulness by conducting quantitative and qualitative experiments within a specific environment. Results indicate our new technique is more efficient in selection and modification tasks than other existing techniques including Go-Go and Ray-casting in terms of the task completion time and accuracy.