American Fisheries Society 1()1 



form of jar it was thought that there would not only be a saA'- 

 ing of eggs. Init of labor as well. The result of stiulv and in- 

 vestigation along these lines has been the formation of a jar a- 

 herein described. 



The new jars were used throughout the Avinter hatching sea- 

 son at Detr(Ut, and in oiseration they worl^ed even better than 

 had been anticipated, for the poor eggs separated very readily 

 from the good, and it was only every three or four days that a 

 siphon was put in to assist in completing the separation. Thi< 

 was not necessary by any means, but was merely done to some- 

 what hasten the final ''cleaning u]r". An evidence that the use 

 of a si])hon was not required, and to show how nearly automatic 

 this new form really is, it can be stated that one jar was never 

 touched from the time the eggs were put in during Xovember 

 until a few days before they hatched tlie following April. As 

 the eggs fungussed they rose to the top, and while some passed 

 out, the most of them formed a mass which became attached to 

 the tube near the upper end, and remained there until poked 

 out with a feather just before hatching. The remaining eggs 

 were of excellent quality, and it is firmly believed that this jar 

 which was left untouched throughout the winter, produced more 

 fry than did those which were frequently drawn off' with a 

 siphon. Of course the plan of leaving this mass of fungussed 

 eggs in the jar for three months or more is not to l)e recom- 

 mended in general practice, but it shows what can bo done in 

 the way of obtaining a jar which is virtually automatic. In 

 actual use on an extensive scale, it is thought that the best plan 

 would be to simply use a feather every few days in going over 

 the eggs and break loose any bunches that might form, thus 

 permitting them to pass out. Or if not yet fastened to the tube 

 or neck of the jar, the slight additional aid occasioned by touch- 

 ing with a feather would be sutficient to caus'^ the bunches of 

 fungus to flow from the jar. (Vjmparing this method of attend- 

 ing to the jars with that of daily drawing off with a siphon, it 

 may readily be perceived that the saving of labor in favor of the 

 improved form and method is worth careful consideration. 



The increased length of the lip or overflow is thought to be 

 of considerable advantage over other forms employed, as in us- 

 ing the Clark jar the water is thrown well over into the receiving 



