Meteorological Observations. 399 



has succeeded in obtaining many of them in a distinctly crystallized 

 state, particularly crystals of the antimoniates of magnesia, cobalt and 

 nickel, which are isomorphous. They consist of regular six-sided 

 prisms. In all the salts of antimonic acid which have been inves- 

 tigated, the proportion of the oxygen of the base to that of the acid 

 is as 1 to 4'6 ; they therefore contain some excess of base which is 

 united to water, so that these compounds are to be considered as salts 

 which contain two acids, antimonic acid and water. The salts of 

 antimonic acid also contain water of crystallization : in the crystal- 

 lized salts this commonly amounts to twelve atoms, whilst if these 

 salts are obtained in the amorphous state they usually contain only 

 six atoms of water. The composition of the first may be best ex- 

 pressed by the formula 



ROHO + 12(ROSb05-fl2HO). 

 If it be heated to 212° F. it loses 8 atoms of water; at 390° it 

 loses 10 atoms, and at 572° 11 atoms. In the salts of antimonic 

 acid heated to 572° we may therefore assume for one atom of 

 antimonic acid two atoms of base, of which one is water ; and in the 

 salts heated to 390°, three atoms of base, of which two consist of 

 water. — Bert. Monatsbericht, 1852, p. 344. 



METEOROLOGICAL OBSERVATIONS FOR SEPT. 1852. 



Chiswick. — September 1. Slight rain. 2. Foggy : cloudless and bot. 3, 4. Very 

 fine. 5. Overcast : clear. 6. Very fine : rain at night. 7. Hazy : rain. 8. Heavy 

 rain : thunder and lightning : cloudy : clear at night. 9. Cloudy : showery. 10, 

 Cloudy. 11,12. Fine. 13. Very fine. 14. Clear: cby air : densely overcast at 

 night.' 15. Overcast. 16. Fine: clear and cold at night. U. Shght fog, -with 

 veo' heavy dew : very fine : clear and cold. 18. Foggy : heavy rain. 19. Cloudy: 

 uniformly overcast. 20. Slight rain : showery : clear. 21. Boisterous, with rain. 

 22. Clear : very fine. 23, Overcast : vei7 fine. 24. Foggy : vei-y fine : dense fog 

 at night. 25. Dense fog : very fine. 26. Heav)' dew : foggy : hazy throughout. 

 27. Dense fog : overcast : heavy rain at night. 28. Constant rain : barometer very 

 low : foggy. 29. Cloudy : slight showers : cloudy. 30. Overcast : fine but windy : 

 overcast. 



Mean temperature of the month 56°-20 



Mean temperature of Sept. 1851 55 -15 



Mean temperature of Sept. for the last twenty-six years ... 57 "15 



Average amount of rain in Sept 2"52 inches. 



Boston. — Sept. 1. Cloudy. 2. Fine. 3,4. Cloudy. 5. Cloudy: rain a.m. 

 6. Cloudy: rain p.m. 7. Cloudy: rain : thunder and hghtning early a.m. : rain p.m. 



8. Fine. 9. Fine : rain p.m. 10. Fine. 11— 13. Cloudy. 14. Fine. 15. Cloudy: 

 rain a.m. and p.m. 10. Fine: rain early a.m. 17. Fine. 18. Fine: rain a.m. 

 and P.M. 19, 20. Cloudy : rain early A.M. 21. Rain : rain a.m. 22. Fine. 23. 

 Cloudy. 24. Fine. 25—27. Foggy. 28. Rain : rain a.m. and p.m. 29. Cloudy : 

 rain a.m. 30. Fine. 



Sandwich Manse, Orkney. — Sept. 1 . Showers. 2. Clear : fine : cloudy : fine. 

 3. Clear: fine. 4. Bright : clear: fine: aurora. 5. Fog. 6. Hazy : cloudy. 7 — 



9. Fine: clear: fine. 10. Cloudy: showers. 11. Showers: drops: aurora. 

 12. Showers: aurora. 13,14. Sleet-showers. 15,16. Showers. 17. Bright: 

 showers : aurora. 18. Drizzle : rain. 19. Bright : clear : rain. 20, 21. Bright : 

 cloudy : rain. 22. Showers : cloudy. 23. Cloudy : rain. 24. Showers : clear. 

 25. Bright : cloudy. 20. Clear. 27. Showers : rain. 28. Showers : lunar rain- 

 bow. 29. Bright : cloudy : rain. 30. Rain : cloudy. 



Mean temperature of Sept. for twenty-five yeais 52'''22 



Mean temperature of this month 53*45 



Average quantity of rain in Sept. for six years 2-49inches. 



