Meteorological Obsenkitiom. 



that which succeeds It act upon each other like a pair of jaws, each 

 furnished with an array of sharp conical teeth, while the la;^t com- 

 pound member of the series plays over the upper surface olf rt^ , 

 eighteenth segment. 



The author then proceeds to describe the muscles which move 

 this complex apparatus. The extensors are small and feeble, but 

 the flexors are, as might be anticipated, more complex and power- 

 ful. They are two in number. The first has its origin in the large 

 flask-like dilatation, and is inserted by a tendon into the second 

 compound piece, from which the second muscle arises, and is in- 

 serted, also by tendon, into the third piece. — Proc. Roy. Soc. 



METEOUOLOGICAL OBSERVATIONS FOR APRIL 1853. 



Chiswick. — April 1. Rather boisterous : fine. 2. Cloudy : fine : hazy. 3. Over- 

 cast : showery. 4. Cloudy : very fine : rain. 5„ Densely overcast : rain : clear. 

 6. Overcast throughout. 7. Overcast : very fine : clear. 8. Fine : heavy thunder- 

 storm : clear at night frosty. 9. Clear : fine, but cold : overcast. 10. Overcast. 

 11. Overcast: fine: overcast. 12. Clear: fine: overcast. 13. Cloudy and cold : 

 rain : clear : sharp frost at night. 14. Cloudy. 15, 16. Overcast throughout. 

 17. Fine : overcast. 18. Very fine. 19. Cloudy : rain. 20. Low white clouds 

 and cold. 21. Rain. 22. Constant rain. 23. Fine. 24. Heavy rain. 25. Snow 

 early A.M., boisterous, with rain. 26. Fine. 27. Hoar-frost : very fine. 28. Light 

 haze : fine. 29. Cold rain. 30. Overcast : very fine. 



Mean temperature of the month 44°"93 



Mean temperature of April 1852 44 '81 



Mean temperature of April for the last twenty-seven years . 47 "21 

 Average amount of rain in April l'65inch. 



Boston. — April 1. Fine : rain a.m. 2. Fine : rain p.m. 3. Cloudy : rain p.m. 

 4. Cloudy : rain a.m. and p.m. 5. Cloudy. 6. Cloudy : rain p.m. 7. Fine. 8. 

 Cloudy : rain and hail A.M. and p.m. 9. Fine. 10, 11. Cloudy. 12. Fine. 13. 

 Cloudy : rain a.m. 14 — 18. Cloudy. 19. Cloudy : rain p.m. 20. Cloudy : rain a.m. 

 21. Cloudy. 22. Cloudy : rain a.m. 23. Fine. 24". Fine : hail a.m. 25. Rain : 

 rain a.m. and p.m. 26. Fine. 27. Fine : rain a.m. 28. Fine. 29. Cloudy : 

 rain p.m. 30. Cloudy. 



Sandtvici Manse, Orkney. — April 1. Drizzle a.m : rain p.m. 2. Damp a.m. 

 and p.m. 3. Showers a.m. : damp p.m. 4. Hazy a.m. : showers p.m. 5. Showers 

 a.m. : cloudy, S. aurora p.m. 6. Rain a.m. : showers, S. aurora p.m. 7. Showers 

 A.M. : showers, S. aurora p.m. 8. Hail-showers a.m. and p.m. 9. Clear a.m. : 

 rain p.m. 10. Showers a.m.: rain p.m. 11. Bright a.m. : cloudy p.m. 12. 

 Showers A.M. : clear P.M. 13. Drops a.m. and p.m. 14. Clear a.m. : cloudy p.m. 

 15,16. Drops A.M. and P.M. 17. Bright a.m. : drops p.m. 18. Showers a.m. : 

 drops P.M. 19. Drops a.m. : rain p.m. 20. Clear a.m. : clear, fine, aurora p.m. 

 21. Hoar-frost a.m. : clear, fine, aurora p.m. 22. Bright a.m. : hazy, large halo p.m. 

 23. Showers a.m. : drops p.m. 24. Bright a.m. : sleet-showers p.m. 25. Sleet- 

 showers A.M. : hail-showers p.m. 26. Bright a.m. : clear p.m. 27. Showers a.m. : 

 drops P.M. 28. Clear a.m. : showers p.m. 29. Bright a.m. : clear p.m. 30. 

 Cloudy A.M. : clear p.m. 



Mean temperature of April for twenty-si.\ previous years ... 43°"44 



Mean temperature of April 1852 47 '64 



Mean temperature of this month 44*49 



Average quantity of rain in April for seven previous years . 1'73 inch. 



Ann. is Mag. N. Hist. Ser. 2. Volsii. 32 



