574 Transactions. — Chemistry and Physics. 



P.S. — I should have mentioned that the south polar anti- 

 cyclone inserted in the diagram (Plate LV.) is at present 

 hypothetical. We have no facts here to guide us ; only 

 reason and analogy. The cyclones also surrounding it are 

 evidenced only by very low barometric pressure, and winds 

 in varying directions ; and on the eastward rate of progress 

 of these cyclones we have no information. 



The evidence for the remainder of the scheme of atmo- 

 spheric circulation is so strong that it seems to have passed 

 out of the realm of hypothesis into that of established fact in 

 its main features. But it must be borne in mind that the 

 positions in latitude of the belts of "highs" and "lows" 

 fluctuate constantly, and that probably the more northern 

 cyclones may sometimes blend with those farther south in 

 the intervals between anticyclones, and that possibly a similar 

 blending of the more northern anticyclones with those far 

 south of them may sometimes temporarily occur. 



Notes on the Ship's Logs. 

 (1.) Voyages from Caj^e of Good Hope to New Zealand. 



25th August, 1891. — The voyage commenced in a tropical 

 storm. The ship soon ran into the anticyclone belt, which 

 was rather more southerly than usual, and in which she expe- 

 rienced some gales, probably caused by the tropical storm on 

 its northern side. 



29th February, 1892. — During this voyage easterly winds 

 prevailed, and it would seem that the belts of cyclones and 

 anticyclones were displaced northwards. 



22nd May, 1893.— The indications in this voyage were 

 very similar to those in the voyage of February and March, 

 1892, and lead to the same conclusion : that the high and low 

 belts were abnormally displaced northwards. 



5th November, 1893. — The high and low belts were in 

 their usual positions. 



1st April, 1894. — The ship ran into a tropical storm on the 

 third day after leaving the Cape ; then she passed south of 

 the normal anticyclone belt, and experienced the gales of the 

 northern part of a cyclone, in which she voyaged for about 

 a week. The belts of "highs" and "lows" were in their 

 normal latitudes in this voyage. 



18th August, 1894. — Westerly winds and gales were expe- 

 rienced during the whole voyage, showing that the high and 

 low belts were in their normal latitudes. 



29th January, 1896.— The "highs" and "lows" were in 

 their usual positions, but the ship voyaged in fine weather in 

 the interval between two cyclones, the hindermost of which 

 overtook her on the last day of the voyage. 



