Meteorological Observations. 239 



This liquor, when not strong, has the colour of weak tincture of 

 litmus, but when concentrated it appears black ; it remains clear for 

 two or three days, but after this the oxide is entirely precipitated, 

 and remains at the bottom of the vessel in the form of a blue cloud. 

 The addition of a soluble salt to this liquor, when heated, occasions 

 the instantaneous separation of the oxide, and a few drops of hydro- 

 chloric acid soon render it bright. 



It does not always happen that distilled water produces the above 

 described appearance, but the cause of the variation is not apparent ; 

 the mode of solution appears, however, to be similar to that of iodide 

 of starch, prussian blue, &c. &c. — Ann. de Ch. et de Phys., Juillet 

 1844. 



Parabolic elements of the comet discovered by m. 



victor mauvais, july 7j is'i*, as computed by himself. 



Time of perihelion passage, October 1844 14' 7 681 Paris mean time. 



Logarithm of perihelion distance 9*8817875 (5^=0-7617) 



Longitude of perihelion 176° 35' 42" 



Longitude of the ascending node 35 37 42 



Inclination 49 41 23 



Motion retrograde 



Comptes Rendus, 15 Juillet, 1844. 



METEOROLOGICAL OBSERVATIONS FOR JULY 1844. 

 Chiswick.—SvXy 1. Slight haze: cloudy: thunder, with rain from 6 till 8 p.m. 

 2. Rain : cloudy. 3. Cloudy. 4. Slight rain : cloudy. 5, 6. Fine. 7. Hazy 

 and mild : overcast. 8. Hazy: very fine. 9 — IL Very fine. 12. Very fine : 

 showery. 13. Rain: heavy rain at night. 14, 15. Clear and fine. 16. Over- 

 cast. 17. Fine : dusky clouds : hazy. 18. Very fine : cloudy. 19. Overcast: 

 thunder quarter to 1 p.m. : thunder- showers in afternoon. 20, 21. Clear and fine. 

 22. Cloudless and very hot. 23, 24. Sultry. 25. Very hot. 26. Cloudy : clear. 

 27. Hot and dry. 28. Very fine: cloudy. 29. Hot and very dry : exceedingly 

 clear at night. 30. Overcast: rain. 31. Cloudy and fine : clear. — Mean tem- 

 perature of the month 1° above the average. 



Boston. — July 1. Fine : rain a.m. 2. Cloudy. 3. Fine. 4. Fine: rain p.m. 

 5. Rain. 6 — 8. Cloud)'. 9 — 11. Fine. 12. Fine : rain a.m. 13. Fine : rain 

 a.m. and P.M. 14. Stormy. 15. Fine: rain a.m., with thunder. 16. Fine: 

 rain p.m. 17. Fine. 18. Fine: rain p.m., with thunder and lightning. 19. Fine : 

 rain p.m. 20, 21. Fine. 22. Fine: thermometer 81° 2 o'clock p.m. 23. Fine : 

 thermometer 80° 3 o'clock p.m., in the sun 1 12°. 24. Cloudy: rain a.m. 25. 



Fine : rain p.m. 26, 27. Cloudy. 28. Fine. 29. Fine : rain early a.m. : rain 



P.M. 30. Cloudy: rain p.m. 31. Cloudy : rain, with thunder and lightning a.m. 



Sandwich Manse, Orkney. — July 1. Cloudy. 2 — 6. Drizzle: showers. 7 — 9. 



Cloudy. 10. Cloudy: showers. 11. Showers: cloudy. 12. Damp: cloudy. 



13. Bright : cloudy. 14. Cloudy. 15. Cloudy: clear. 16. JBright : clear. 17. Clear. 



18. Clear: showers. 19. Cloudy: showers: drizzle. 20. Cloudy. 21. Cloudy : 

 showers. 22. Cloudy : fine. 23. Clear : fine. 24. Bright : cloudy. 25. Clear : 



fine. 26. Clear : fog. 27. Clear : fine. 28. Bright : showers : fog. 29. Drizzle. 

 30. Cloudy. 31. Rain. 



Ajyplegarth Manse, Dumfries-shire. — July 1. Fine: a few drops of rain. 2 — 4. 



Fine : sultry. 5. Fine, but cloudy. 6. Slight shower. 7. Fine and fair. 8. 



Fine: a few drops of rain. 9. Fine, but cloudy. 10. Showers. 11. One shower. 



12. A few drops of rain. 13. Heavy rain. 14. Showers: thunder. 15 — 17. 



Showers. 18. Showers: thunder. 19. Slight shower: thunder. 20. Fair. 



21. Wet all day. 22. Fine. 23. One heavy shower ; thunder. 24—26. Rain: 



heavy p.m. 27. Beautiful day. 28. Showers. 29. Fair. 30, 31. Rain. 



