As the molecules expand in the warm air The sap cells flow upward without a care From the tighter root cells of the cold thawing ground To the warmer branches is where they’re bound Then in the rain the cool upward side Constricts to lift the branches to cause the rain to glide Down the trunk to the roots where the sap is made Because the warmer underside of the branch bows up with pride And for all this the deciduous tree provides us shade During the summer’s hot tide Then falls the air temp and the tree constricts Sending the sap cells back into the ground The warmer roots is where they will be found During winter’s chill while the trunk restricts