482 Meteorological Observations. 



ment proved the constancy of the reaction, which is more brilUant in 

 proportion as the action of the sulphuric acid is slow. 



These particles of cellulose (true amylaceous corpuscles) only exist 

 in the vicinity of the cerebral ventricles, especially in the deep layers 

 of the ependyma in the nerves of sensation and in the spinal cord. 

 They are very frequent in the latter in the central gray substance 

 described by M. Kolliker, which, according to my observations, ex- 

 tends from the ependyma of the fourth ventricle to the terminal 

 filament of the spinal cord, and corresponds to the ependyma of the 

 obliterated central canal of this portion of the nervous axis. On this 

 account it might be called the central cord of spinal ependyma. 



All the other concentric corpuscles have a different composition. 

 Neither the concretions of the pineal gland and choroid plexus, nor 

 the granules of the excrescences of Pacchioni, nor the plates extracted 

 from the spinal arachnoid, exhibit any vegetable reaction. The cor- 

 puscles of cellulose are quite peciiliar to the ependyma, which is 

 neither a prolongation of the arachnoid, nor of the pia mater, but 

 rather the superficial free layer of the connective tissue of the nervous 

 elements. It is on this account that these granules are also found in 

 the gray substance of the olfactory nerve. — Comptes Rendus, Sept. 26, 



1853, p. 492. 



METEOROLOGICAL OBSERVATIONS FOR OCT. 1853. 

 Chiswick. — October 1. Heavy clouds: clear. 2,3. Clear and fine: frosty at 

 nights. 4. Rain. 5. Constant rain. 6. Dense fog. 7. Hazy and damp : fine : 

 rain. 8. Rain: fine: clear. 9. Foggy: fine. 10. Very fine. 11. Fine. 12. 

 Rain. 13, Hazy: rain. 14. Foggy : very fine. 15. Fine : cloudy : rain at night. 

 16, 17. Rain. 18. Clear and fine. 19. Heavy rain. 20. Fine. 21. Rain. 22. 

 Rain : fine. 23. Densely overcast : cloudy and fine. 24, 25. Fine. 26. Very 

 fine: rain at night. 27. Cloudy: overcast: lightning in the evening : rain. 28. 

 Cloudy and fine : rain. 29. Cloudy and fine : clear. 30. Foggy : clear. 31. Very 



fine. Mean temperature of the month 49°'99 



Mean temperature of October 1852 46 -22 



Mean temperature of Oct. for the last twenty-seven years . 50 '06 



Average amount of rain in Oct 2"64 inches. 



Boston. — Oct. 1. Cloudy: rain a.m. 2. Fine: rain p.m. 3. Fine. 4. Rain 

 A.M. 5. Cloudy : rain a.m. and p.m. 6. Rain a.m. 7. Cloudy. 8. Cloudy : 

 rain A.M. and P.M. 9. Cloudy. 10. Fine: rain p.m. 11. Cloudy: rain a.m. 

 and P.M. 12. Cloudy: rain a.m. 13,14. Cloudy : rain p.m. 15. Cloudy. 16. 

 Rain a.m. and p.m. 17. Cloudy : rain a.m. and p.m. 18. Cloudy. 19. Cloudy : 

 rain a.m. and P.M. 20. Cloudy. 21. Cloudy : rain a.m. 22. Fine. 23,24. 

 Cloudy. 25. Foggy. 26. Cloudy : rain p.m. 27. Cloudy. 28. Cloudy : rain a.m. 

 29. Cioudy. 30, 31. Fine. 



Sandivick Manse, Orkney. — Oct. 1. Showers a.m. and p.m. 2,3. Sleet-showers 

 a.m. and p.m. 4. Rain a.m. : showers p.m. 5. Showers a.m.: drizzle p.m. 6. 

 Bright a.m. : cloudy p.m. 7. Drizzle a.m. : rain p.m. 8, 9. Damp a.m. and p.m. 

 10. Cloudy A.M. and p.m. 11. Showers am. : cloudy p.m. 12. Cloudy a.m. : 

 damp P.M. 13. Cloudy a.m. and p.m. 14. Cloudy a.m. : showers p.m. 15. 

 Bright A.M. : showers P.M. 16, 17. Showers a.m. and p.m. 18. Showers a.m. : 

 bright p.m. 19. Cloudy a.m. : rain p.m. 20. Clear a.m. : showers, aurora p.m. 

 21. Rain a.m. and p.m. 22. Clear a.m. : showers p.m. 23. Clear a.m. : showers, 

 aurora P.M. 24. Cloudy a.m. : drizzle p.m. 25, 26. Cloudy a.m. : rain p.m. 27. 

 Bright a.m. : clear, aurora p.m. 28. Cloudy a.m. and p.m. 29. Bright a.m. ; 

 cloudy P.M. 30. Clear, fine A.M : cloudy p.m. 31. Rain a.m. : showers p.m. 



Mean temperature of Oct. for twenty-six previous years 47^'64 



Mean temperatuie of this month 48 "66 



Mean temperature of Oct. 1852 46-88 



Average quantity of rain in Oct. fo- thirteen previous years . 4-99 inches. 



