482 



Meteorological Observations. 



nient proved the constancy of the reaction, which is more brilliant in 

 ^ ^ j)roportion 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 I 

 described by M. KoUiker, 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 - 

 j .^ jj, obliterated central canal of this portion of the nervous axis. On this 

 ™ ^ account it might be called the central cord of sjyinal ependyma. 



All the other concentric corpuscles have a diiferent 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- 



i puscles of cellulose are quite peculiar 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 



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



i^ *" the gray substance of the olfactory nerve. — Comptes Rendus, Sept. 26, 



j "' 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. 

 t'.tu 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 



1 Average amount of rain in Oct 2"64 inches. 



I +! "^- 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. 



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



\% % rain a.m. and p.m. 20. Cloud'y. 21. Cloudy : rain a.m. 22. Fine. 23, 24.; 



'/oco Cloudy. 25. Foggy. 26. Cloudy : rain p.m. 27. Cloudy. 28. Cloudy : rain a.m. ^ 



' " '^ 29. Cloudy. 30, 31. Fine. \ ' 



Sandwick 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 a.m. : 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. j 



Mean temperature of Oct. for twenty-six previous years 47°"64 ~ — r^ 



Mean temperature of this month 48*66 ' &», 



Mean temperature of Oct. 1852 46*88 ^/r 



Average quantity of rain in Oct. for thirteen previous years . 4*99 inches. 



