APPENDIX: VALIDITY OF METHOD 



507 



Whilst the consecutive indicator samples were being taken the Continuous Plankton 

 Recorder was also working. It was not however intended that the indicator series should 



17455 



MILLION5 



1500 



1000 



500 



4500 



4000 



3500 



3000 



2500 



2000 



-1500 



000 



500 



2 3 4 5 



H0UR_ 



o 

 o 

 en 



1 1 1 1 1 1 1 rz — ri 1 1 T7 — ri 1 1 1 1 1 1 1 r 



6 7 8 9 10 II 12 13 [14] 15 16 17 [l8j 19 20 21 22 23 24 25 26 



C0N5ECUTIVE INDICATOR HAUL5 I mile EACH 



▲ ▲ ▲ ▲ 



o 

 o 



CU 



o 

 o 

 o 



C\J 



o 

 o 



CM 



a 

 a 

 n 



OJ 



Fig. 30. Histograms showing the total phytoplankton and total Copepoda taken in the same series of 

 consecutive Indicator samples referred to in Figs. 28 and 29. Samples 14 and 18, indicated by 

 asterisks, were unfortunately lost before analysis. 



give results to be compared exactly with those from the Recorder for the latter was being 

 tested at a standard depth of 10 m. for the cruise whereas the indicator was not then 

 designed to reach a depth of more than a few metres. Further, on this occasion the 

 recorder propeller, an experimental one, was only winding on one section of the roll for 

 every 3-5 miles of sea traversed and again the apertures of the two instruments varied, 



7-2 



