with Remarks on the Construction of its different Parts. 131 
The 9th and 14th. The branches were already so much 
scattered that observations of them could no longer be made 
with any accuracy. 
Alterations in the Angle of the Direction of the Envelope. 
Nov. 4. 10 feet reflector. Large double eye-glass. The 
streams departed from their source in a greater angle of di- 
vergence. This probably arose from a contraction of the en- 
velope towards the sun, but not about the root of the streams, 
where it remained extended as before. 
Nov. 13. 10 feet. The angle of the bending of the enve- 
lope at its vertex was considerably enlarged. In the night- 
glass the divergence of the streams themselves was certainly 
not increased. 
Nov. 24. 10 feet. The divergence of the light, which may 
still be called the envelope, although no longer to be distin- 
guished from the head, was from 60 to 65 degrees ; but in 
the night-glass, the branches which were hardly to be seen 
were closer together than formerly. 
The additional faint duplicates of the envelope Nov. 4, 5, 13, 
and 14 always departed from the vertex in an angle consider- 
ably greater than the permanent interior streams. 
The Shortening of the Tail . 
The 5th of November, the air being very clear, I found, 
when attending to the tail of the comet, that its length was 
much reduced ; its utmost extent not exceeding ia£ de- 
grees. 
The 9th, it was 10 degrees long. 
The 13th. In the night glass the tail was much shortened. 
S 2 
