S18 



in accordance with the principles of the cyclonic theory. The motions of 

 the cirri, at the time of the passage of each storm, were then extracted 

 from the register, arranged in a column adjoining that in which the 

 motions of the cyclones were entered, and a comparison instituted he- 

 tween them. In some instances where cirri were not observed on the 

 day of the passage of a cyclone, observations made on the preceding or 

 following day were employed, but only where it was obvious that the 

 motions of the upper currents were steady, or the amount of their veering 

 kno^vn. This veering of the upper currents, it may be remarked, ap- 

 pears to follow the same law as the veering of the currents nearer the 

 surface. It is often mther sudden. " Backings " also are occasionally 

 observed, and generally it would appear that the upper currents are 

 affected by cyclonic (or rather perhaps cyclonoidal) movements similar in 

 character to those which prevail in the lower regions of the atmosphere, 

 but of a higher order. 



The following table shows the results of a comparison of the cyclonic 

 movements, greater and lesser, observed during part of the period 

 embraced in the preceding table, made np according to the same 

 method : — 



Nine mouths, April to December, inclusive. + Six months, viz. Jan., Feb., Sept., Oct., Nov. & Dec. 



