150 LEMON SOLES 



the end provide data which would go far towards solving the 

 problem of fluctuations in the catch, when some one finds time 

 and opportunity to correlate with it observations on the food of 

 baby lemon-soles on the lines of Dr. Lebour's work. 



Future Investigations 



The lemon sole is a valuable fish ; at Christmas 1920 it was 

 fetching at Billingsgate twelve to fourteen shillings a stone, 

 when turbot was selling at eight to eleven shillings, halibut at 

 sixteen to twenty shillings, and soles at eleven to fifteen 

 shillings. It is therefore a species in which all persons who fish 

 the northern and southern portions of the North Sea are 

 necessarily interested. 



The very wide gaps in our knowledge of its life-history have 

 been 'indicated ; the main problem appears to be, ' Why have 

 lemon soles not ever been suspected of being " fished out ", while 

 so many other kinds of fish have (rightly or wrongly) thus been 

 suspected ? ' The working out of the answer entails researches 

 into the effect of many factors on its hatching and early develop- 

 ment. They will be of interest not only in themselves, but 

 (probably) as checks upon deductions made from analogous 

 or contrasted factors in the lives of other fishes. 



