oe a 
G. Jones on the Zodiacal Light. 163 
interfere to prevent. In the case of that one exception, I saw 
the light; but being shut up among the houses in Canton, I could 
hot get reliable boundaries. 
he development of facts in the Zodiacal Light came upon me 
gradually, and, before they had disclosed themselves, much val- 
uable time in the high southern latitudes, at the early part of our 
cruise, was lost; on our return, however, we went still further 
to the south, and I was able to make amends in some measure 
for this loss. : 
There is no mention made in any books on the Zodiacal Light, 
of any differences in the light itself;* but I very soon be 
hotice that there was a Stronger Light at the central part, or 
Which Cassini has oi en the boundaries in his written accounts. 
It is not to besa sed by the reader that any of these kinds 
when my eye had got accustomed to observations, I was generally 
se make out without much singe ate ad 
© Soundary which is given in my charts. 1 
of the Diffuse Light was also tolerably well marked. That : ya 
not fanciful in this, is shown by the frequency with whic soiree 
Tsons on board, both officers and seamen, when pe : 
do 80 by me, and without any leading questions, drew boundary 
* Unless, following extract from Mairan’s Traité Physique 
t Historique de Crore Boreal, refer to such a diference: "Jai encore obeervé 
ois, qu’aprés que la Lumiére Zodiacal 
weurs 1 t part . = 
"me de lance ou de fusean, toute la partie du couchant démeurait plus éclairée que 
la Teste du ciel, sur 30 ou 40 dégréa d’amplitude.” P. 36. 
