170 HENRY A. HUNT. 



still working further round to due north, with a few light cirrus 

 forming and evaporating east of this point, and a general drift to- 

 the east, then thunder cumulus worked up from south-west very 

 slowly, the advanced cirrus reaching Sydney at 3*30 p.m. ; no 

 trace of cloud observable with surface wind up to this time ; a 

 roll of cloud appeared at 3*15 p.m. above south horizon (See 

 Plate 5, taken at 3*43 p.m.), which seemed to be made up of 

 a band of stratus surmounted by cumulus 30° in length ; at 4 

 p.m. the roll merged into the general clouds, which were then 

 fringed overhead and stratified on the southern boundary, beyond 

 which the sky was clear for a space of about 10°, at the same 

 moment an uneven roll of heavy cumulus began to rise above the 

 horizon; as it lifted, the sky still further beyond was clear. Up to 

 this hour, 4 p.m., only one strata of cloud visible, and that moving 

 from south-west ; a very dense and extensive cloud of smoke to 

 south-west, which worked backwards and forwards between north- 

 west and south-east on the horizon. At 4 -20 p.m. the eastern 

 point of the roll was immediately over Botany Bay, the western 

 limit extending indefinitely to the west. (See the details in Plate 6, 

 taken at this time.) Small shower at 5*15 p.m. The cloud roll 

 then seemed to melt away like the earlier one, and the upper 

 clouds still moving from south-west became very wild looking, 

 and Plate 7 was taken at 5*50 p.m., showing only a trace of the 

 cloud roll and the disturbed looking upper clouds. Southerly 

 burster arrived at 5 '55 p.m., but depth of the current very shallow, 

 for the clouds were still maintaining their course from the south- 

 west. The cumulus observed earlier in the evening, at 6 p.m. 

 remained stationary until 7 "30 p.m., with general outline unchanged, 

 but with variations in facial aspects meanwhile rising to higher 

 altitudes. At 7*15 p.m. a fine cluster of festoon clouds developed 

 on a prominent outstanding cloud to the west. As the evening 

 became cooler a few light cirro-cumulus clouds came up from the 

 south at 7*35 p.m., the cumulus of the upper strata first dissolved 

 into cirrus when the influence of the southerly reached them, 

 and then quickly dispersed before the wind; lightning visible 

 occasionally to the north until 8*30 p.m. 9 p.m., cirro-cumulus 



