Meteorological Observations. 175 



tions of greenish porphyry, slightly lamellar in structure, and of red 

 ochreous clay. Near the northern pass Mr. Burr noticed a granu- 

 lar rock, or volcanic hreccia. The inclination of the beds is gene- 

 rally 15° from the crater. 



Numerous perpendicular dykes intersect the volcanic rocks, and 

 are harder and more compact than the beds they traverse. Small 

 veins of calcedony also occur. 



Dr. Malcolmson showed Mr. Burr some specimens of black and 

 green obsidian obtained on the promontory, but the conditions 

 under which they exist Mr. Burr was prevented from ascertaining. 



The deposits of consolidated sea-sand occur more especially near 

 the northern pass, towards the base of the volcanic ridges. The 

 stratification is diagonal, and this arrangement Mr. Burr conceives to 

 have been produced by the drifting of opposing currents. The flat 

 line of coast on the northern part of the promontory, the author 

 says, is evidently a raised beach, and the consolidation of the sand he 

 assigns to the action of a tropical sun upon the calcareous materials. 

 The stone incloses numerous shells and corals of species existing in 

 the Arabian Sea. 



METEOROLOGICAL OBSERVATIONS FOR JUNE 1841. 



Chiswick. — June I, 2. Very fine. 3,4. Fine, with very dry air. 5. Slightly 

 overcast. 6. Very fine : slight rain. 7. Cold and dry : showery and cold. 8, 

 9. Cloudy and cold. 10. Very fine. 11. Cloudy. 12. Slight rain : clear. 13. 

 Cloudy and cold: clear at night. 14. Very fine. 15. Slight drizzle: cloudy 

 and fine. 16,17. Very fine. 18. Sultry: rain, with distant thunder and light- 

 ning at night. 19. Sultry: rain. 20. Very fine : rain. 21. Heavy showers, 

 with sultry intervals. 22. Very fine : cloudy. 23. Overcast and fine : very 

 heavy rain at noon. 24. Showery : heavy rain at night. 25. Rain. 26. Cloudy. 



27. Showery. 28. Rain. 29. Cloudy : showery. 30. Fine. — The mean tem- 

 perature of the month was about 2° below the average. 



Boston. — June 1 — 4. Fine. 5, 6. Cloudy. 7. Cloudy : rain a.m. and p.m. 

 8. Cloudy : rain early a.m. 9. Cloudy. 10. Fine. 11— 13. Cloudy. 14—17. 

 Fine. 18. Fine: therm. 3 o'clock 74°. 19. Cloudy: rain early a.m. : rain p.m. 

 20. Fine: rain p.m. 21. Cloudy: brisk wind. 22, 23. Fine. 24. Fine: rain, 

 with thunder and lightning p.m. 25. Kain. 26. Cloudy: rain p.m. 27. Fine. 



28. Rain : rain p.m. 29. Fine: rain with thunder and lightning p.m. 30. Fine. 

 Applegarth Manse, Dumfries-shire. — June 1. Clear and warm. 2. Bright and 



cool. 3. Hail-showers : thunder. 4. Cloudy. 5. Cloudy : rain p.m. 6. Fine but 

 cloudy. 7. Dry and cool. 8. Dry and cool: withering. 9 — 11. Dry and cool. 

 12. Dry and cool, but warmer. 13. Dry and cool. 14. Slight showers. 15, 

 16. Dry and droughty. 17. Dry and droughty : cloudy. 18. Fine rain and 

 thunder. 19. Rain p.m. 20. Very warm : rain p.m. 21. Heavy showers. 

 22. Fair all day. 23. Fair and fine. 24. Fair and fine : thunder. 25. Wet 

 nearly all day. 26. Slight showers : thunder. 27. Fair till 4 o'clock : rain. 

 28. Showery all day. 29. Showery all day : thunder. 30. Rain p.m. 



Sun shone out 28 days. Rain fell 11 days. Thunder 4 days. Hail 1 day. 

 Wind north 2 days. North-east 4 days. East-north-east 1 day. East 3£ days. 

 South-east 2 days. South-south-east 2 days. South 3 \ days. South-south-west 

 1 day. South-west 4 days. West 4£ days. West-north-west 1 day. North- 

 west 1 § day. 



Calm 7 days. Moderate 9 days. Brisk 2 days. Strong breeze 9 days. 

 Boisterous 3 days. 



Mean temperature of the month 54 o, 05 



Mean temperature of June 1840 54 *40 



Mean temperature of spring-water 50 '80 



