Meteorological Observations. 423 



The distilled product is then put into a porcelain vessel with ex- 

 cess of hydrated carhonate of zinc, and digested on a sand-bath for 

 two or three hours at a temperature of 1 94° Fahr. ; the liquor, fil- 

 tered while hot, is evaporated over the naked fire until there remains 

 about a pint of it ; and the evaporation is to be continued to dryness 

 on plates in a stove. 



By this process M. Lefort obtained at three different times 262, 

 277, and 284 grains of valerianate of zinc from about two pounds of 

 valerian root. 



When it is intended to employ valerian root for the preparation 

 of valerianate of zinc, it is requisite to have it fresh dried ; the author 

 obtained considerable difference of product when using the recently 

 and long-dried root. 



It is even probable that valerian root does not always contain the 



same proportion of oil at different times of the year, it being well 



known that the leaves of the lauro-cerasus yield different quantities 



of hydrocyanic acid at different seasons. — Journ. de Pharm. et de Ch., 



Septembre 1846. nI •" 



; to ei noii 



METEOROLOGICAL OBSERVATIONS FOR SEPT. 184G. 

 Chiswick. — September 1. Cloudy. 2, 3. Cloudless and hot. 4. Foggy: fine. 

 5. Very fine. 6. Cloudy. 7. Foggy : dusky haze. 8. Overcast. 9. Very fine. 

 10. Cloudy. 11—14. Very fine. 15. Slight fog : very fine. 16, 17. Exceed- 

 ingly fine. 18. Cloudy. 19. Foggy : very fine. 20. Clear and dry air. 21, 



22. Cloudy. 23. Heavy rain. 24. Uniformly overcast : cloudy : overcast. 25. 

 Fine : cloudy : clear and fine. 26. Overcast : slight drizzle. 27. Cloudy and 

 fine: rain. 28. Rain. 29. Clear and cool : rain. 30. Slight fog : cloudy: 

 clear. 



Mean temperature of the month 60°-79 



Mean temperature of Sept. 1845 ,„,m..j,im,„,„. 52 '60 rjr 



Mean temperature of Sept. for the last twenty years ... 57 '22 



Average amount of rain in Sept 2-73 inches. 



Boston. — Sept. 1 — 3, Fine. 4, 5. Cloudy. 6. Cloudy : rain, with thunder 

 and lightning p.m. 7. Cloudy : 2 o'clock, thermometer 77°. 8. Cloudy. 9. 

 Cloudy: rain p.m. 10. Cloudy. 11. Fine. 12. Cloudy. 13—15. Fine. 

 16,17. Foggy. 18,19. Fine. 20,21. Cloudy. 22. Fine. 23. Cloudy : rain 

 early a.m. : rain a.m. 24. Foggy. 25,26. Cloudy. 27. Fine : rain p.m. 28. 

 Cloudy. 29, 30. Fine. 



Sdnilwick Manse, Orkney. — Sept. 1 . Cloudy : rain. 2,3. Cloudy. 4. Hazy: 

 cluu.iy. 5. Cloudy : fog. 6. Bright : fine. 7. Bright : fog. 8. Bright: clear : 

 aurora. 9. Bright : clear. 10. Bright : cloudy. 11. Drizzle: damp. 12. Fine: 

 cloudy. 13. Fog: drizzle. 14. Drizzle: damp. 15. Cloudy : drizzle. 16. Rain : 

 cloudy. 17. Clear: cloudy. 18. Bright : clear. 19. Bright: cloudy. 20. Bright : 

 cloudy: clear. 21. Bright : clear: aurora. 22. Bright: hoarfrost: clear • aurora S. 



23. Bright : cloudy. 24. Rain : cloudy : fog. 25. Clear : cloudy. 26. Cloudy. 

 27. Clear : cloudy : aurora. 28. Clear. 29. Cloudy : rain. 30. Bright : 

 cloudy. 



Applegarlk Manse, Dumfries-shire.— Sept. 1, 2. Very fine harvest day. 3. Very 

 fine harvest day, but threatening. 4. Very fine harvest day : still cloudy. 5. Very 

 fine harvest day. 6. Very fi ne harvest day : thunder. 7. Very fine harvest day. 

 8. Rain a.m. : cleared p.m. 9 — 11. Fair and fine. 12. Fair and fine : thunder. 

 13. Fair and fine. 14,15. Fair and fine : fog. 16. Dull day : fog. 17. Dull 

 and threatening : fog. 18. Still fair, but cloudy. 19. Gentle rain p.m. 20. 

 Rain am. 21. Fair. 22. Fair, but dull. 2:!. Wet a.m.: lightning. 24. Rain. 

 25, 26. Showers. 27. Rain all day. 28. Showers : thunder. 29. Wet all day. 

 30. Fair and clear. 



Mean temperature of the month 59°6 



Mean temperature of Sept. 1845 52 '4 



Mean temperature of Sept. for 23 years 53 -O fttsboii 



Mean rain in Sept. for 18 years 3-25 inches. 



