212 TREUBIA VOL. II, 2—4. 
larvae and pupae are not mutually comparable. For it goes without saying, 
the hunting for pupae and larvae was not always done in the various 
breeding-places with the same number of coolies, nor with the same con- 
centration of purpose (supervision!) and not always for the same length 
of time. Of these latter data I have consequently given in Table V only 
the totals for each 10°/,, (or 5°/ 9) salinity class. In order to furnish a basis 
for comparison | have subsequently expressed in Table IX the totals of 
the emerged 22 of /udlowi in percentages of the totals of the emerged 
QQ of rossii in other words I have calculated how many female 
ludlowi had emerged per 100 female rossii, first for the different parts 
of the Batavia marine fishpond zone, and next for the whole of that zone, 
for the several 10°/,, and 5 °/,, salinity classes. 
For further comparison I have similarly put down in Table IX also 
for the totals of the mosquito-net catches (cf. Table V) the number of 
ludlowi QQ proportionately to 100 rossit 29. ! resolved upon this after 
I had become convinced that, even when the salinity rose as high as nearly 
85 °/,o no diminution of the empang production of rossii was to be 
observed, in other words that in sharp contrast to what obtains for the 
production of /udlowi, the figures for the production of rossii are independent 
of the salinity, within the limits of the salinities recorded in the series of 
observations of Tables IV — XI (3.4 °/,, — 84 6 /oo)- 
The totals for /udlowi and rossii 99 in Table IX which belong together, 
J have each time placed one over the other, divided by a horizontal line. 
On dividing the number placed above the line (the total number of Q9 of 
ludlowi) by the number below the line (the total of rossii 99) and multi- 
plying the quotient by 100, the result is the figure placed after the horizontal 
line and the following symbol =, which therefore shows the number of 
ludlowi QS per 100 rossii 99. 
In conclusion I have put together in Table XI the averages and other 
resultant figures, relating to the entire Batavia empang zone, from Tables 
Vil A, B and IX. 
The Tables VI, VIII and X correspond respectively with the Tables V, 
VII and IX, with however this difference that whereas in the-latter three 
tables the data have been arranged topographically and in the order of 
the salinities, in the three former tables the arrangement of the data is 
topographical and chronological. Moreover I have not calculated any 
figures relating to the whole of the Batavia sea fish-pond zone in the 
Tables VIII and X, whilst this has been done in Tables VII (A and B) 
and IX. For, since the salinity, which has a preponderating influence on the size 
of the /udlowi-production, may differ widely in different parts of the Batavia 
empang belt during the same month (cf. Chapter II, Table VI and Table VIII), 
there would be no sense in attempting to compute mutually comparable final 
monthly figures such as monthly averages for the whole of the Batavia empang 
region. There is consequently no Table XII to correspond with table XI. 
