20. Rules controlled by contract or title
Incidents of customary easements
21. Bar to use unconnected with enjoyment
22. Exercise of easement Confinement of exercise of easement
23. Right to alter mode of enjoyment
24. Right to do acts to secure enjoyment Accessory rights
25. Liability for expenses necessary for preservation of easement
26. Liability for damage from want of repair
27. Servient owner not bound to do anything
(b) Right to light or air acquired by grant
(c) Prescriptive right to light or air
(d) Prescriptive right to pollute air or water
