of the Fishery Board for Scotland. 



299 



flexure of the body to the right or left shortens the distances taken — 

 namely, the projections of the distances on the lateral axis. A certain 

 amount of evidence bearing upon the extent to which contortion may give 

 rise to error is afforded by six mackerel, which were used to test the effect 

 of freezing on the dimensions of the body. The following Table gives a 

 comparison between the measurements taken in the fresh state, and the 

 measurements found for the same characters after the fishes had been in 

 the cold-storage-room for twenty -five days: — 



T 



[Table. 



