Meteorological Observations. 479 



It results from this analysis that anatase consists almost entirely 

 of titanic acid ; if it were composed of the blue oxide of titanium, an 

 increase of weight should have been obtained by its oxidizement ; 

 but, notwithstanding the precautions employed to avoid all loss, the 

 results of the analysis always amounted to less than the substance 

 employed, which induced M. Damour to suppose that he has not 

 committed any error in estimating the titanium in anatase to be at 

 the maximum of oxidation. 



Rutile from Saint- Yrieix in semi-transparent reddish crystals, 

 cleavable according to the faces of a rectangular prism, was analysed 

 in the same method, and yielded 



Titanic acid 97*60 



Peroxide of iron .. 1*55 



99-15 

 M. Damour concludes from his experiments that there is no dif- 

 ference in the composition of anatase and rutile. — Ann. de Ch. et de 

 Phys., Avril 1844. 



METEOROLOGICAL OBSERVATIONS FOR APRIL 1844. 

 Chiswick. — April I. Foggy: dry haze: clear. 2 — 4. Very fine : clear and dry. 

 5, 6. Overcast : very fine : clear. 7. Clear and fine throughout. 8. Foggy : 

 clear and fine. 9. Fine: clear and dry. 10. Hot and very dry. 11. Fine. 



12. Fine : rain at night. 13. Cloudy: rain. 14. Hazy: showery. 15. Hazy: 

 very fine. 16. Hazy: cloudy : clearandfine. 17. Foggy : very fine. 18. Cloudy 

 and fine. 19 — 24. Very fine. 25. Slight haze : very fine. 26. Dry haze. 27, 



28. Clear and dry. 29. Fine: dry haze: cloudy. 30. Clear, with excessively 

 dry air. — Mean temperature of the month 3*44° above the average. 



Boston. — April 1. Foggy. 2 — 4. Fine. 5. Fine : rain a.m. 6—8. Fine. 

 9. Cloudy. 10. Fine. 11,12. Fine: rain p.m. 13. Cloudy : rain p.m. 14. 

 Fine. 15. Cloudy. 16—19. Fine. 20, 21. Cloudy. 22—28. Fine. 29. Cloudy. 

 30. Fine.— N.B. This month has been extraordinarily dry and warm. 



Sandwick Manse, Orkney. — April 1, 2. Cloudy : showers. 3. Bright : showers. 

 4. Cloudy. 5. Cloudy: rain. 6. Clear: cloudy. 7. Cloudy. 8. Bright: cloudy. 

 9. Clear: cloudy. 10. Cloudy. 11. Showers: clear. 12. Clear: cloudy. 



13. Cloudy : rain. 14. Bright : cloudy. 15. Bright: showers. 16. Cloudy. 

 17, 18. Bright: showers. 1 9. Rain : cloudy. 20. Bright : cloudy. 21. Cloudy . 



22. Cloudy: showers. 23. Cloudy: sleet-showers. 24. Bright: cloudy. 25. 

 Rain: fine. 26. Rain : showers. 27. Hail-showers : clear. 28. Bright: clear. 



29. Clear. 30. Bright : clear. 



Applegarth Manse, Dumfries-shire. — April 1. Fine. 2. Dull: rain p.m. 3. 

 Rain. 4. Fair, except one slight shower. 5. Rain. 6. Fine : hoar-frost. 7. 

 Fine. 8. Fine, but cloudy. 9. Wet a.m. : fine, 10. Fine. 11. Fine: one 

 slight shower. 12, 13. Rain. 14, 15. Wet. 16. Hoar-frost. 17. Fair: 

 rain p.m. 18,19. Fair. 20. Fair and fine. 21. Fine : one slight shower. 22, 



23. Fine. 24. Shower early a.m. 25. Fair. 26. Fair : heavy dew. 27. Fair. 

 28, 29. Hoar-frost. 30. Fair and dry. 



Mean temperature of the month 47°*2 



Mean temperature of April 1843 46 "4 



Mean temperature of spring water 50 '5 



Mean temperature of ditto April 1843... 47 "0 



