Meteorological Observations. 79 



him ; its character is said to be, that, of the seven genera composing 

 the family, it presents the smallest number of longitudinal nervures 

 in the wings. Pictet possessed only two specimens, both females, 

 and belonging to one species, which he calls O. anomala ; one of 

 them was received from Vienna and said to come from Brazil ; the 

 derivation of the other was unknown. 



The wings of the present Ephemera, which I will name Oligo- 

 neuria rhenana, after the shedding of the last membrane are trans- 

 parent and of a pure white ; the nervures are yellowish. The body 

 is brownish-yellow in the female, of a purer brown in the male ; the 

 former is about 4 lines, the latter 5 lines, in length. The caudal 

 setae of the female are about half the length of the abdomen ; those 

 of the male as long as the whole body. The compound eyes of the 

 male are of a globular form and include nearly the whole of the head, 

 whilst in the female they are much smaller and inserted in the sides 

 of the head. Only two wings are visible until after the casting of the 

 last skin, when four make their appearance. — Bericht iiber die Verh. 

 der Naturf. Gesellsch. zu Basely x. 1852, p. 177. 



METEOROLOGICAL OBSERVATIONS FOR NOV. 1853. 



Chiswick. — November 1. Cloudy and fine. 2. Very fine. 3. Foggy. 4. Very 

 fine : overcast. 5. Uniform haze : clear at night. 6. Rain : foggy : uniformly 

 overcast. 7. Foggy: overcast. 8. Foggy: fine: clear. 9. Clear and fine. 10. 

 Frosty : fine : foggy. 11. Dense fog : clear at night. 12. Overcast. 13. Foggy : 

 densely overcast. 1 4. Foggy : overcast. 15. Dense fog : rain at night. 16. Fine. 

 17. Frosty : fine. 18. Sharp frost : very fine. 19. Frosty: fine : clear and frosty. 

 20. Overcast : rain : clear and frosty. 21. Frosty : clear. 22. Foggy. 23. Dense 

 fog. 24. Overcast : rain. 25. Hazy and dull : rain. 26. Overcast. 27. Fine. 

 28. Overcast throughout. 29. Densely overcast : rain. 30. Hazy : slight rain. 



Mean temperature of the month 40°-14 



Mean temperature of November 1852 47*38 



Mean temperature of Nov. for the last twenty-seven years . 43 "18 

 Average amount of rain in Nov 2*38 inches. 



Boston. — Nov. 1 — 4. Fine. 5. Cloudy. 6. Cloudy : rain a.m. 7. Cloudy. 

 8 — 12. Fine. 13. Fine : rain p.m. 14. Fine. 15. Foggy : rain p.m. 16. Rain: 

 rain a.m. 17—19. Fine. 20. Rain: rain a.m. 21, 22. Fine. 23. Cloudy. 

 24, 25. Cloudy: rain p.m. 26. Rain: rain a.m. 27. Cloudy. 28. Cloudy: 

 rain p.m. 29. Cloudy : rain a.m. and p.m. 30. Cloudy : rain a.m. 



Sandwick Manse, Orkney. — Nov. 1. Cloudy a.m. : rain p.m. 2. Cloudy a.m. : clear 

 P.M. 3. Clear,fine a.m. : clear p.m. 4. Damp a.m. and p.m. 5. Cloudy a.m. and p.m. 

 6. Rain a.m. : clear, fine p.m. 7. Drizzle, showers a.m. : clear p.m. 8. Rain a.m. : 

 hail-showers, lightning p.m. 9. Cloudy a.m. : damp p.m. 10. Cloudy a.m. : 

 showers p.m. 11. Sleet-showers a.m.: showers p.m. 12. Bright a.m.: clear, 

 fine p.m. 13. Cloudy am. : clear, fine p.m. 14. Cloudy, frost a.m. : damp p.m. 

 15. Clear, frost a.m. and p.m. 16. Cloudy, frost a.m. : clear, frost p.m. 17. Clear, 

 frost A.M. and p.m. 18. Showers a.m. : cloudy p.m. 19. Cloudy a.m. : rain, 

 cloudy P.M. 20. Clear, fine A.M. : sleet-showers P.M. 21. Clear, fine a.m. : clear 

 p.m. 22, Bright A.M. : clear, aurora S. p.m. 23. Bright a.m. : clear p.m. 24. Cloudy 

 a.m. and p.m. 25. Bright a.m. : rain p.m. 26. Clear, frost a.m. : clear, aurora 

 P.M. 27. Clear, frost a.m. : rain p.m. 28. Clear a.m. : clear, aurora p.m. 29. Rain 

 a.m. : clear, aurora p.m. 30. Bright a.m. : clear, aurora p.m. 



Mean temperature of Nov. for twenty -six previous years 42^ 59 



Mean temperature of this month 44 '87 



Mean temperature of Nov. 1852 41 '52 



Average quantity of rain in Nov. for thirteen previous years . 4-38 inches. 



