148 BRAIN AND BODY OF FISH 



known to cause an increase of thyroid activity ; we have more 

 direct evidence of the effect of the anterior lobe on migration as the 

 increase in size, the increase of the acidophile cells immediately 

 precedes migration, the onset of which coincides with the appearance 

 of both ova and sperm. We hope that another year of monthly 

 examinations may add further confirmation of these observations 

 and conclusions. 



