Scientific Intelligence 
m 
Mayer and Mean Error. 
-flfason’s Tables. Long. Lat. 
From 1783— 1788, 30"4 14". 4 
Mason’s Tables. 
From 1 789 — 1 804, 2 7" 5 1 3". 6 
Ltplace and Mason. 
1805—1812, - 20". 5 8" 2 
Laplace and Burg. 
~h 6". 5 8".3 
± 54 7 - 7 
Hh 4.8 6.3 
-h 5.6 6.5 
/ ± 5 ‘ 3 6 * 7 
( — 0.5 
/ ± 6 - 4 6.7 
| — 2.3 
{z 6 i 7,0 
See Quarterly Journal, vol. x. p. 166. and vol. xv. p. 131. 
OPTICS. 
3. Phosphorescence and Structure of the Chara vulgaris 
and hispida. — While examining the distribution of the aggre- 
gated groups of the carbonate of lime which forms a great por- 
tion of these plants, and which are essential and integral parts 
of their constitution, Dr Brewster found that the plants were 
phosphorescent, when laid upon heated iron, so as to display their 
entire outlines in the dark. He ascertained that each group or 
mass of the calcareous matter consisted of minute aggregated 
particles, which possessed double refraction, and had regular 
neutral and depolarizing axes. They are held to the stem of 
the plant by a very fine transparent membrane. It is surprising 
that some of our most eminent botanists should have been so 
much misled as to suppose the calcareous matter to be an acci- 
dental deposit, from the water in which they vegetate. 
METEOROLOGY. 
4. Remarkable Hail-shozver. — In August 1813, the British 
army occupied a range of mountain district, extending from Ron- 
cesvalles to St Sebastian. About this period, the forces under 
Marshal Soult were anxious to get possession of the pass of 
1813, 
1814, 
1815, 
1816, 
1817, 
1818, 
4819, 
1820, 
Mean Error. 
Laplace and Burg. Long. Lat. 
i — 5 " 3 
l — l - 7 
Laplace andBurclchardt. 
+: 4". 7 
+ 3.1 
1817, 
1818, 
1819, 
1820, 
1821, 
{ 
| ± 5.0 
l + 2.3 
f — t 4.5 
L + 3.0 
f±4.4 
| + 3.4 
r± 4,4 
1 — 3.0 
7". 6 
4". 7 
5.2 
4.6 
5.7 
4.3 
