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{ _ from the altitude of 70° to 20°, so that the zenith was quite clear of cumulus, 
and over the hills of Kostrena we could see in parts blue sky and in parts the 
upper clouds. Above the cumulus two layers of small strato-cumulus were 
visible, which distinguished themselves from each other by differences in their 
motion. Through the interspaces of the strato-cumulus some long streaks of 
cirrus running North and South appeared ; these moved to the Southward. 
‘*Over the middle of the Bay of Buccari small patches of cloud were forming 
themselves throughout the day, and had no horizontal movement at first, but 
__ when they grew bigger and began to ascend, they moved quickly to the North- 
east and East, at a rate I estimated at 15 or 16 metres per second, and they 
disappeared in the main mass of the cumulus. Just over Kostrena similar 
cloud patches could be seen, growing smaller and smaller and at last vanishing. 
The main mass of the cumulus showed no progressive motion. 
‘*Farly in the morning the wind was North, force 3, Afterwards it came from 
all directions, at times North-west, South-west, South-east, and North-east. 
Towards noon the axis of the cumulus shifted towards South, and it broke up into 
separate fragments. In the afternoon it became compact again. Below Kostrena, 
in the Gulf of Fiume, the. wind blew in frightful squalls from West and North- 
west. In the harbour of Portoré there were violent squalls from all directions. 
_ The local steamer which plies between Fiume and Buccari had some heavy sacks 
actually blown off her deck. It is impossible to imagine the existence of sucha 
permanent mass of cumulus unless on the assumption of a rotatory motion about a 
horizontal axis.” [The author illustrates this by a diagram which shows a marked 
ascending movement over Buccari as evidenced by the constant fresh formation 
_ of cumulus, and the influx of air from all sides. ] 
‘‘ Above a horizontal motion from South-west, and at noon from West, appears, 
and over the Gulf of Fiume there was a descending and returning motion, as 
_ proved by the loose fragments of cumulus and by the wind. It is probable there 
"was a similar mass of cumulus over the mountains to the North-east. The 
phenomenon lasted till five p.m. 
** The same phenomena were observed on the afternoon of the 17th, hut not so 
distinctly. Such circulations are not rare here, and are probably dite to the 
formation of the ground, which is in terraces. When there is a Bora, which 
there was on the days in question, there is usually a long bank of cumulus 
in the N orth-east, from which particles break loose but never reach the zenith, 
oyer Buccari, In the South-west they reappear and vanish on the horizon, 
This shows a descending followed by an ascending motion,” 
Dr. Hann appends a note pointing out the analogy between the 
‘phenomena described in the paper, and the Table-cloth at the 
Cape, and the Helm Wind, 
