Meteorological Observations. 95 



pound of sugar of gelatin with a nitrate ; and, in faet, the nitro-sac- 

 charates may he obtained by treating the saccharates with nitric acid. 

 The following are the formulae of the various compounds of sugar 

 of gelatin which have been mentioned : — 



Sugar of gelatin C 32 H™ N 8 O 14 



in salts C 32 H 30 N 8 O" 



combined with silver C 32 H 30 ■ N 8 O" (Ag O) 

 copper C 32 H 30 N 8 O 11 (Cu O, 

 lead C 32 H 3 ° N 8 O" (Pb 0) 

 Nitro-saccharic acid cry- "1 C32 H30 N8 Qu , N2 Q3 y s^ qv, 



stallized / v ' v ' 



Nitro-saccharic acid dried \ r „ H30 N8 OM mt Qb)0 (R% Q s 3 



at 230° Fahr / U n >N U U U } (n ^> 



in salts C 32 H 30 N 8 O 11 (N 2 O 5 ) 4 (H 2 O) 2 

 Nitro-saccharate of silver C 32 H 30 N 8 O 11 (N 2 6 ) 4 (Ag O) 4 (H 2 O) 2 

 of potash C 32 H 3 ° N 8 O 11 (N 2 s ) (K O) 4 (H 2 O) 2 . 

 Journal de Pharmacie, t. xxvii. p. 37. 



Preparing for Publication. 

 The Geology and Mineralogy of Engineering : including the Prin- 

 ciples of the sciences of (Economic Geology and Mineralogy as ap- 

 plied to the Arts. By Edward William Brayley, Fellow of the 

 Linnsean and Geological Societies, Associate of the Institution of 

 Civil Engineers, Corresponding Member of the Royal Geological 

 Society of Cornwall, &c. 



METEOROLOGICAL, OBSERVATIONS FOR MAY 1841. 



Chiswkk. — May 1. Fine: very hot: clear. 2. Very fine: cloudy. 3. Rain. 

 4. Foggy: cloudy and fine : very heavy fall of rain at night. 5. Rain: cloudy 

 and fine : lightning at night. 6. Rain : cloudy. 7. Fine : rain. 8. Heavy 

 showers. 9,10. Very fine. 11. Overcast: slight rain at night. 12. Cloudy 

 and fine. 13. Fine. 14 — 16. Very fine. 17. Cloudy and windy. 18. Fine. 

 19. Rain with strong wind. 20. Boisterous : showery: cold at night. 21. Dry 

 haze : rain. 22. Showery and mild. 23. Slight haze : cloudy and fine. 24. Fine. 

 25. Very fine. 26. Hot and dry. 27. Sultry : much sheet-lightning at night, 

 with occasionally some of the zigzag and forked kind, together with thunder, 

 and abrupt showers falling in large drops. 28. Sultry : very fine. 29. Very 

 fine: lightning at night. 30,31. Overcast and very fine. 



Boston. — May 1. Fine: therm. 66° half-past 2 p.m. 2. Cloudy: rain with 

 thunder and lightning p.m. 3. Cloudy. 4. Cloudy : rain early a.m. 5. Rain. 

 6. Cloudy: rain early a.m. 7. Cloudy: rain p.m. 8. Rain. 9. Fine. 10. 

 Cloudy. 11. Fine : therm. 72° 8 o'clock p.m. : rain p.m. 12. Cloudy. 13. Fine. 

 14. Cloudy. 15. Fine : therm. 69° 3 o'clock p.m. 16. Fine. 17. Cloudy : rain 

 p.m. 18. Cloudy. 19. Rain: stormy p.m. 20. Stormy: rain a.m. and p.m. 

 21. Fine. 22. Cloudy: rain early a.m. 23. Cloudy. 24—27. Fine. 28. 

 Cloudy: therm. 79° 3 o'clock p.m. : rain p.m. 29. Fine. 30. Cloudy. 31. 

 Fine. N.B. This May month has been warmer than any preceding May month 

 since 1834. 



Applegarth Manse, Dumfries-shire. — May 1. Fair and fine : thunder. 2. Driz- 

 zling afternoon. 3. Fair i frosty : hail. 4. Rain all day. 5. Rain occasionally. 

 6. Pair and fine. 7. Rain for four hours. 8. Rain p.m. : thunder. 9. Fair 

 till night: rain p.m. 10. Fair but cloudy. 11. Wet a.m. : cleared up. 12 — 15. 

 Fair and fine. 16, 17. Wet nearly all day. 18, 19. Showers a.m., then fine. 

 20. Showers. 21. Fair and fine. 22. Wet a.m. : fine p.m. 23. Fair but gloomy. 

 24. Fine summer day. 25, 26. Bright and cool. 27. Parching wind and hot 

 sun. 28. Fine : rained a little. 29. Fair and fine. 30. Soft rain from eleven 

 to four. 31. Fine summer day. 



