AND NEIGHBOURING SEAS DURING 1897. 



205 



The general features of the direction of drift throughout the year 

 may conveniently be summarised by plotting out for each successive 

 month the number of batches recovered to eastward or westward of 

 their position in the preceding month. The following table contains 

 the results of an analysis of this kind for the English Channel, the 

 North Sea records being for the present omitted : — 



Monthly Sinnmary showiny the direction taken by drift-bottles 

 in the English Channel, 1897. 



Coinmence- 

 inent of Drift. 



No. of 

 batches 

 put out. 



Month of 

 Recovery. 



Direction 

 of Drift. 



No. of 



batches 



recovered. 



Remarks. 



January. 

 February. 



March. 



April. 



I 



May. 



June. 



July. 



September. 

 October. 



20 



4 

 1 







(but cf. 



III. 1). 



2 



*1 (X.) 

 6 

 1 

 4 

 2 

 1 



*1 (xxv.) 



1 (XXX.) 



"I January batches were in 

 t the North Sea after the 

 I end of March. 



February batches were 

 mostly near Calais in 

 May, and in the North 

 Sea subsequently. 



Batch no. xxx. was put out 

 on March 3 1st, and pro- 

 perly speaking, illustrates 

 April and not March con- 

 ditions 



Tlie westward drifts here 

 recorded for the summer 

 months were subsequently 

 overpowered by the pre- 

 ponderating eastward 

 movement. 



Temporary westward drifts 

 subsequently overpowered 

 by eastward movement. 



These cases show that even 

 in summer the prepon- 



derating 

 wards. 



drift was east- 



Marked westward drift in 

 October. 



* These drifts were of very short duration (only one day each). 



If now we condense this summary into a statement of the aggregate 

 number of westward and eastward drifts for each month in the year 



2 



