ACROSS
1. Xylem of any conifer (8) 5. Small country residences (8) 9. Edible smooth-shelled nut of the North American hickory (5) 10. Walk lamely (4) 11. Mend (6) 12. Descriptive of salts, clays and silts that are transported to lower soil 14. Largest living land mammal (8) 17. Nourishing substances (9) 19. Type of East African antelope, mostly black, with long horns (5) 21. Piquant (5) 22. Allowed or caused water to run off land (7) 23. Raw animal skins with fur attached (5) 25. Haughty (5) 27. Making land more valuable by cultivation (9) 29. Insects that suck sap from plants (8) 32. Explosive consisting of matter saturated with nitroglycerine (8) 33. Source of a river (6) 34. Common domestic cattle (4) 35. Bring upon oneself (5) 36. Apparatus that reduces electrical current (8) 37. Spirit often flavoured with fruit (8)