BULLETIN OF THE UNITED STATES PI8H COMMISSION. 31 



water (iu degrees, Fain-.) at the time of impregnation are shown in detail 



in Table II. 



Table II.— Record of seine hauling at the Fori Washington shore, hcohoh of I 



A review of the record furnishes the following conclusions : 



(1) That at no time during the season were the males in marked pre- 

 ponderance over the females. 



(2) That for the entire season the number of females was considerably 

 iu excess of the number of males, the relative percentage being, fema I 

 r>i.:> per cent; males, 45.7 per cent. 



(3) The proportion of ripe females in the entire number of sliad takeu 

 was 9 per cent; the proportion of ripe females in the entire number of 

 females taken was 17 per cent. 



(4) The average yield of eggs per ripe female was . the num- 

 ber ranging from six thousand to one hundred and two thousand. 



Conclusion four is, probably, generally applicable to the shad in the 

 Potomac River. Conclusions one, two, and three can be held to apply 

 only to the Fort Washington shore. A discussion of like data obtained 

 from other shores would possibly lead to conclusions widely different. 



CENTRAX STATION. 



In connection with the main work of the station, special attention 

 was given to devising a successful method for hatching the adhesive 

 eggs of the herring, including Clupea mediocris, or hickory jack. Lvers 



