CA^fADIAX FLSHERIES EXPEDITIOy, lOl-'f-lo 



143 



In view of the great similarity between the samples of grown fish from Magdalen 

 islands and Northumberland strait, it would be of little use to go into the question 

 as to how far the present samples of young fish more resemble those from the former 

 or those from the latter waters ; they may fairly be said to exhibit a considerable like- 

 ness to both. 



4. Samples from North Sydney compared with the highly exceptional sample from 

 St. Georges hay, Newfoundland. — As repeatedly mentioned already, one of the sam- 

 ples from the Newfoundland coast differed greatly from all the rest in. point of age- 

 composition, while exhibiting, on the other hand, a very strong resemblance to a sam 

 pie taken at the same time from Xorth Sydney. It will now be well to compare these 

 two samples from the point of view of individual growth. 



There is no age group which is particularly well represented in these two sam- 

 ples, group 7 (=year-class 1908 if, as would seem to be the case, new Summer growth 

 had not commenced at time of capture) is the best, and comprises 23 specimens in 

 the North Sydney sample, and 25 in the other. After these, come age groups 11 and 

 12 (presumably corresponding to year-classes 1904 and 1903). In the following com- 

 parative tables, where the errors of averages have been called into requisition, age- 

 gi'oup 7 is taken separately, groups 11 and 12 being combined into a single group, in 

 order to furnish a reasonable number. 



Table 26 shows averages for group 7 in the two samples, in addition to which, the 



standard errors of the averages and the values of the fraction -^ are also noted. 

 Table 26. — Showing averages for growth dimensions t^-t. for the divergent sample 

 from St. Georges Bay and for sample from North Sydney. (Year class 1908, 



presumably). At foot the differences and values of fraction -j-. 



Sample. 



N. Sydney 



St. George's Bay . 

 Difference (D). . . 



D 



d 



10-40 



10-28 



012 



0-29 



9 43 

 22 



0-51 



41G 

 4 28 

 012 



52 



2-64 

 2-79 

 0-15 



0-79 



1-79 

 1-89 

 010 



83 



It will be noticed that this age group exhibits the most perfect uniformity as 

 regards growth, and in no single instance, among those investigated, does th*» diffe- 

 rence between two averages equal the magnitude of their errors. 



Very similar results are arrived at in the case of groups 11 and 12. Table 27 

 shows these two groups compared in the same manner as with group 7. 



Table 27. — Showing averages for grovrth dimensions /, — t^ for the divergent sample 

 from St. George's Bay, and for sample from North Sydney. (Year class 1903 and 



1904 presumably). At foot the differences and values of fraction — r . 



Sample. 



N. Sydney 



St. George's Bay. 



Difference (D). . . 



D 



78 

 0-82 

 004 



0-57 



