[ 345 1 
m m Ccecx appendices veficulx, quae in hoc cada- 
vere breves fuerunt. 
n n Appendices aliqux ramofx. 
o Du&us fcniinifcr per profratam euns. 
f Duftus veficulx excretorius ipfi infertus. 
XIII. A Letter from John Marty n, M. D. 
Prof. Botan. Cantab. & F.R.S. to the Prefi - 
dent) concerning an Aurora Borealis feen 
February 16. 1749-50. 
SIR , Chelfey, Feb. ai. 1749*50. 
Read Feb - 22 / r ^\ N Friday the 16th there was a bright 
1 / +9-5°* Aurora Borealis, the Northern Part 
of the Sky being intirely filled with a pale Light, in 
which frequent Corufcarions were vifible. Befides 
thefe Lights, there was a perfect uniform Arch, ex- 
tending from Eaft to Weft : the Colour of it was the 
fame with that of the Aurora ; with which however 
it did not feem to have any Communication, being 
placed feveral Degrees to the Southward. The Shoul- 
ders of Orion were vifible thro’ this luminous Arch, 
in the Weftern Part of it, and Cor Leonis in the 
Eaftern Part. I did not happen to fee it till about 
a Quarter before Ten ; and at Ten it difappeared. 
The Weather was then, and has been ever fince, ex- 
ceedingly warm for the Seafon. The Walls are 
covered with Blofioms ; and the Hyacinths, Daffodils, 
&c. are blown before the ufual time. I am, with 
the greateft Refped, 
SIR , 
Tour moft humble Servant , 
John Martyn, 
