Meteorological Observations. 319 



acid, these numbers lead to the formula SAgO^ + AgONO^ + HO. 

 Such a compound is certainly without any known analogue. 



Another mode of representing the constitution of this body is to 

 suppose that it consists of nitrate of peroxide, AgO'^ 6N0\ and that 

 the water is only a mechanical admixture. 100 parts should then 



contain— Silver 81-19 



Oxygen 17-05 



Nitrogen 1-76 



It may also be regarded as containing nitrous acid, NO*, combined 

 with peroxide and water, 6AgO-+NO*+HO. 



Mahla is, however, inclined to regard it as being essentially per- 

 oxide, containing mechanically mixed nitrate of silver and water ; 

 and the fact observed by Fischer, that when prepared with a solu- 

 tion of sulphate instead of nitrate of silver, the product contains sul- 

 phate of silver, supports this view, as does the observation made by 

 Mahla, that fluoride of silver treated in the same way yields a body 

 behaving in all respects like peroxide, and when heated evolving 

 vapours which corrode glass strongly. — Ann. der Chem. undPharm., 

 vol. Ixxxii. p. 289. 



METEOROLOGICAL OBSERVATIONS FOR AUG. 1852. 

 Chiswick. — August 1. Very fine : uniformly overcast. 2. Very fine : densely 

 clouded. 3. Partially overcast : slight shower. 4. Fine: clear. 5. Fine : slightly 

 overcast. 6. Showers: heavy rain. 7. Cloudy: clear. 8. Fine: clear. 9,10. 

 Very fine. 11. Constant hea%7 rain. 12. Heavy rain : cloudy. 13. Very fine : 

 clear. 14. Very fine: heavy rain at night. 15. Foggy: clear at night. IG. 

 Heavy dew : fine : overcast. 17. Densely overcast : frequent vivid lightning and 

 distant thunder: chiefly sheet lightning till 11 p.m., then forked hghtning, with 

 heavy thunder and rain in torrents. 18. Very fine : cloudy, with lightning at 

 night. 19. Very fine : clear at night. 20. Overcast. 21. Light clouds : uni- 

 formly overcast. 22. Overcast : clear. 23. Cloudy and fine. 24. Overcast and 

 mild : rain at night. 25. Cloudy and fine. 26. Slight haze : very fine : clear. 

 27. Very fine. 28. Foggy : remarkably dusky and dark about 9 a.m. : very fine. 

 29. Very fine : densely overcast : hght clouds. 30. Cloudy : very fine : clear. 

 31. Clear : very fine. 



Mean temperature of the month 63°'67 



Mean temperature of Aug. 1851 62 '79 



Mean temperature of Aug. for the last twenty-six years ... 62*12 



Average amount of rain in Aug 2-44 inches. 



Boston. — Aug. 1. Cloudy. 2. Fine. 3. Cloudy : rain p.m. 4. Fine. 5. Fine: 

 rain p.m. : thunder and lightning. 6. Fine : rain p.m. 7, 8. Cloudy : rain p.m. : 

 thunder and lightning. 9. Cloudy : rain p.m. 10. Fine : rain p.m. : thunder and 

 lightning. 11. Rain: rain a.m. and p.m. 12. Cloudy: rain a.m. and p.m.: 

 thunder and lightning. 13. Fine. 14. Fine : rain and hail p.m. : thunder and 

 lightning. 15. Cloudy : rain a.m. 16. Fine. 17. Fine : rain p.m. : thunder and 

 lightning. 18. Cloudy : rain early a.m. 19. Cloudy. 20. Cloudy : rain early a.m. 

 21 — 23. Cloudy. 24. Cloudy : rain a.m. and p.m. 25. Cloudy : rain a.m. 26, 

 27. Fine. 28. Cloudy : rain p.m. 29, 30. Fine. 31. Fine : rain and hail p.m. : 

 thunder and lightning. 



Sandwich Manse, Orkney. — Aug. 1, 2. Cloudy. 3. Cloudy: rain. 4. Bright: 

 clear : fine. 5. Clear : fine : aurora. 6. Clear : fine. 7. Drops : clear : fine. 

 8. Bright : clear : fine. 9. Clear: fine. 10. Bright: fine: clear: fine: aurora. 

 11. Bright : fine : clear : fine. 12,13. Bright : fine : cloudy: fine. 14. Bright: 

 fine : clear : fine. 15. Clear : fine. 16. Cloudy: djops. 17. Fog: cloudy. 18. 

 Drizzle : showers ; clear. 19. Drizzle : bright : fine. 20. Showers : briglit : fine. 

 21. Clear: fine: fog. 22. Fog: fine: fog. 23. Bright: fine: cloudy: fine: 

 aurora. 24. Cloudy : fine : clear : fine. 25. Clear : fine : aurora. 26. Clear : 

 fine: cloudy: fine. 27. Cloudy: fine. 28. Bright: fine: cloudy: fine. 29. 

 Damp: clear: fine. 30,31. Bright: fine: clear: fine. — This month has been 

 very fine, warm and dry. 



Mean temperature of Aug. for twenty-five years 54 -75 



Mean temperature of this month 60°-64 



Average quantity of raiu in Aug. for six years , 305 inches. 



