Translation Series No.1211

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the age groups 2.B to 4.B the deviations from the age determinations are
less than 5.6 per cent and those for the age group 1.B amount to 10 to 11
Per cent. On account of the large deviations, the system cannot.be used
for the 5L.year old smolt.
M Skkriteazel
im Jo&
40
2,0 4-
log number of sclerites in the 1st year
0,5
1,0 In des Smoltalters
45
log age of smolt
Fig. 32 a. Relation between the mean number of sclerites
after one year in fresh water and the.duration of the total
sojourn in the river (mean values of the age group).
We have now to enquire whether deviations of 5 per cent or
even 10 per, cent are permissible in our determinations. Doubtlessly, that •
is not so. The data in Table 30. have, however, not been assembled in
order to replace the investigation of age by the classical method, but
1p.' 302]