 Artificial harmonics (also called false harmonics or stopped harmonics), in which the player depresses the string fully with one finger while touching the same string lightly with another finger, can produce any note above middle C. 
Glissando (Italian for "sliding") is an effect played by sliding the finger up or down the fingerboard without releasing the string.This causes the pitch to rise and fall smoothly, without separate, discernible steps.In cello playing, the bow is much like the breath of a wind instrument player.