diff --git a/sdk/metric/meter.go b/sdk/metric/meter.go
index 421e9a4dccf..b53a6c43566 100644
--- a/sdk/metric/meter.go
+++ b/sdk/metric/meter.go
@@ -641,24 +641,6 @@ func (p float64InstProvider) lookupHistogram(name string, cfg metric.Float64Hist
 
 type int64ObservProvider struct{ *meter }
 
-func (p int64ObservProvider) lookup(kind InstrumentKind, name, desc, u string) (int64Observable, error) {
-	aggs, err := (int64InstProvider)(p).aggs(kind, name, desc, u)
-	inst := newInt64Observable(p.meter, kind, name, desc, u)
-	inst.appendMeasures(aggs)
-	return inst, err
-}
-
-func (p int64ObservProvider) registerCallbacks(m measures[int64], cBacks []metric.Int64Callback) {
-	if len(m) == 0 {
-		// Drop aggregator.
-		return
-	}
-
-	for _, cBack := range cBacks {
-		p.pipes.registerCallback(p.callback(m, cBack))
-	}
-}
-
 func (p int64ObservProvider) callback(m measures[int64], f metric.Int64Callback) func(context.Context) error {
 	inst := int64Observer{measures: m}
 	return func(ctx context.Context) error { return f(ctx, inst) }
@@ -676,24 +658,6 @@ func (o int64Observer) Observe(val int64, opts ...metric.ObserveOption) {
 
 type float64ObservProvider struct{ *meter }
 
-func (p float64ObservProvider) lookup(kind InstrumentKind, name, desc, u string) (float64Observable, error) {
-	aggs, err := (float64InstProvider)(p).aggs(kind, name, desc, u)
-	inst := newFloat64Observable(p.meter, kind, name, desc, u)
-	inst.appendMeasures(aggs)
-	return inst, err
-}
-
-func (p float64ObservProvider) registerCallbacks(m measures[float64], cBacks []metric.Float64Callback) {
-	if len(m) == 0 {
-		// Drop aggregator.
-		return
-	}
-
-	for _, cBack := range cBacks {
-		p.pipes.registerCallback(p.callback(m, cBack))
-	}
-}
-
 func (p float64ObservProvider) callback(m measures[float64], f metric.Float64Callback) func(context.Context) error {
 	inst := float64Observer{measures: m}
 	return func(ctx context.Context) error { return f(ctx, inst) }