— 71 — COUNCIL-MARCH 1920- APPENDIX 



Figure 5 shows 548 periods of 95 hours the range being from nil to 12 cm/sec 

 and 150°. 



Figure 6 shows 48 periods of 325 hours the range being from 2.9 to 3.7 cm/sec 

 and 17° in direction. 



A consideration of Figure 1 shows that any resultant based upon observa- 

 tions over 12^2 hours i. e. 1 tide period will be liable to such large errors that it 

 must be valueless ; in fact the drift so determined may bear no relation whatever 

 to the general drift. 



In Figure 2 where 25 hours' observations are shown i. e. 2 tidal periods the 

 pattern is tending towards a strip whose long axis is somewhat to the E. of the 

 N/S line but here again any single resultant is subject to such large errors as to 

 be valueless. 



In Figures 3 — 5 the periods combined for the resultants are 74, 74^2 and 

 75 hours respectively, approximately around 6 tidal periods, but from the similarity 

 of the patterns produced it would seem that such slight variations on the time 

 period do not materially affect the resultants. In these 3 figures there is a distinct 

 tendency for the pattern to take the form of a Hne inclined towards the N.W. From 

 this it would be inferred that the drift at the Varne was generally easterly with 

 very considerable N. and S. deflections. Any single resultant based upon these 

 periods is not trustworthy. 



In each of these figures well over 500 reusltants with '■j^ hour intervals 

 between their commending points have been calculated, but in Figure 6 the period 

 taken was 325 hours, approximately equal to 26 tidal periods, and consequently 

 the number of resultants is reduced to 48. The pattern now is distinctly easterly, 

 but there are not sufficient points to determine what form it is tending towards. 

 A single resultant based on this period would seem to be of general value. 



It must however be remembered that in increasing the period dealt with, 

 the effect is to smooth out the shorter pulsations of the drift, and it is possible 

 that if the original duration of the experiment had been lengthened, the pattern 

 produced by a larger number of resultants, than are here shown might have had 

 a greater surface. This however is dependent upon possible fluctuations of longer 

 cycle than can be detected in 2 week's observations. 



(Signed) T. Edser. 24.2.20. 



Appendix III to Plankton Section. 

 "The Physico-Chemical Conditions underlying Life in the Sea." 



By Professor Stanley Gardiner. 



The ultimate object of the research is to obtain a knowledge of the optimum 

 conditions of growth, reproduction and distribution of the various economic species 

 of marine animals. 



