48 Transactions, — Miscellaneous, 



Now, according to the difference in pressure, wliich has been frequently 

 shown by this diagram as existing between Hokianga and WeUington, it is 

 evident that gales should have been more generally mentioned as occurring 

 at the former station ; but in practice this is not found to be the case nearly 

 so often as these differences would admit ; and this is mainly caused by there 

 being a spreadmg out of the contours at the upper part of the North Island, 

 which will be more readily understood by a reference to Diagram No. 1. 

 The second low area is now shown to the eastward of the colony ; and by 

 the seventh day pressure is shown to be still increasing. The second binding- 

 line has passed the Bluff, and this is evidently the first occasion upon which 

 the barometer has stood at 30 inches at that station since the commence- 

 ment of this series ; pressure at Wellington has risen to 29*90, and to 30-18 

 at Hokianga. This seventh day shows the second depression at a long dis- 

 tance from the land, but it is evident by the contours that it continues to 

 influence the weather, as the winds are still all from the southward ; but 

 there is now again a widening of the contours in the South, showing the 

 approach of a backing wind ; the barometer at Bluff now reads 80"02. A 

 further interval of twelve hours shows that pressure has continued to 

 increase in the North, the readings being 30-0 at Welhngton, and 30-20 

 at Hokianga, but at Bluff it has fallen to 30-0, and the wuid has backed 

 into north. It now becomes evident that the first binding-line of 30-10 

 encloses not only the two areas which have abeady passed, but that perhaps 

 several more may be approaching. The eighth day shows a fall to 29-85 at 

 Bluff, but it has continued rising at Wellington, where the barometer reads 

 30-06, the second binding-line having passed, and pressure has also in- 

 creased at Hokianga to 30-25. The diagram now shows that during the 

 next twelve hours the barometer at Blufi' has fallen to 29-75, and has a third 

 time commenced to rise, wind again changing to the south of west ; and by 

 the ninth day pressure has increased to 29*90, but it has decreased at Wel- 

 lington to 30-02, wind backing about four points, while iDressure has steadily 

 increased to 30-30 at Hokianga ; during the next twenty -four hours, the second 

 and first binding-lines are shown to have passed the southern extreme of the 

 colony, and the barometer has risen at all stations, being now 30-15 at Bluff, 

 30-08 at Wellington, and 30-30 at Hokianga, all mth winds from south- 

 ward. The third depression is seen to the eastward of the South Island ; 

 the barometer continues steadily rising ; and by the eleventh day the first 

 binding-line is shown to the eastward of Wellington, and pressure has 

 increased to 30-26 at Blufi", 30-18 at WelHngton, and 80-33 at Hokianga. 



