1. Viral diseases
5. Magnitudes
10. Increases
14. Small rivulet
15. Siphonophore
16. Shower
17. Sicilian volcano
18. Stormed
19. Companion of Artemis
20. Run-down
22. Impromptu wisecracker (2-6)
23. Stallion
24. Toe or finger
28. Collector's fish
30. Cheek
34. Exclamation of disgust
35. Charles William, US explorer
37. Wools
38. Fertilized eggs
39. Dull sound of impact
40. Sailor
42. Attack
43. Island of Denmark
44. Was unalert
47. Nucleus of a regiment
52. Piano composition
56. Aristotle's gymnasium
57. Mentor
58. Architectural feature
60. Wife of Hercules
61. Exercise of a right to enjoy property
62. Pinafore
63. Pennsylvania port
64. British light submachine gun
65. Lowest tides
66. Make very hot

Down

1. Presumptuous
2. Stone (prefix)
3. Relating to the ulna
4. Thick slices
5. Nimble
6. Irish nationalists
7. City on the Nile
8. Inspected
9. Lamentably
10. Arabia
11. Plaster
12. Awful
13. Most knotted
21. Decorates
25. Blasts
26. At that place
27. Headship of a monastery
28. Islands
29. Musical instrument
30. E.g. mold or truffle (3,6)
31. Confederate
32. Abreast of (2,2)
33. Am able
36. European sea eagle
41. Branch of mathematics
45. Volte face (1-4)
46. Animal functional unit
48. Hurts
49. John, US inventor
50. Old World medicinal shrubs
51. Independent Islamic ruler
53. Depose
54. Algonquin
55. Scruff
56. Focusing device
59. Crop