Read it through once

There are certain Acacias which are particularly interesting. Like most of this order, they have large hollow spines instead of stipules at the base of the leaf. It is inside these spines that the troops of the police-insects live. These Acacias (Oxhorn Acacia, as well as _A. sphærocephala_ and _A. spadicigera_) also produce _sugar_, which is secreted by peculiar gland-like organs on the stalks of the leaves, and even _albuminoids_, for at the tips of the leaflets there are peculiar little bodies which contain albuminous matter.