Report of the Commissioner for the year ending June 30, 1899 . rk than theMcDonald jar. One designed by thesuperintendent and manufactured byDoriiinger & Sons, of White Mills, Pa.,was used this season along with the oldjars, and from the results attained it isbelieved it will be an improvement overthe old form. It is of glass, loh incheshigh and 7 inches in diameter, with aglass spout, thus eliminating the oldmetal spout, which had to be attached tothe jar by rubber gaskets, putty, orcement. The bottom is 5 inches in diam-eter and rests directly on the shelf, obviating the necessity for glass
Report of the Commissioner for the year ending June 30, 1899 . rk than theMcDonald jar. One designed by thesuperintendent and manufactured byDoriiinger & Sons, of White Mills, Pa.,was used this season along with the oldjars, and from the results attained it isbelieved it will be an improvement overthe old form. It is of glass, loh incheshigh and 7 inches in diameter, with aglass spout, thus eliminating the oldmetal spout, which had to be attached tothe jar by rubber gaskets, putty, orcement. The bottom is 5 inches in diam-eter and rests directly on the shelf, obviating the necessity for glass legs, which are apt to break. It workswell with 5 quarts of eggs, using less water than the McDonald jar, andby filling the jar to within an inch of the top it acts automatically, allfungused eggs being carried over into the receiving-trough by the cur-rent of water. They are prevented from entering the lower row of jarsby wire-cloth pockets inserted in the outlet of the discharge water enters the jar through a steel tube with a trumpet-shaped. White-fisli hatching jar designedby J. J. Stranahan. LXXVI REPORT OF COMMISSIONER OF FISH AND FISHERIES. bottom, the internal diameter of which is greater than the externaldiameter of the rubber tube which attaches it to the supply tank. Theadvantage of this arrangement is that it permits the escape of the airupward. Experiments were carried on in order to determine definitely the mosteffective means of preventing the adhesion of eggs while being fer-tilized. It was learned that adhesion may be absolutely prevented byapplying just enough water to fill and slightly cover the egg mass, thenadding (every 10 minutes for the first hour and every 20 minutes forthe second) additional water to cover the eggs, stirring gently eachtime. This operation requires two or three hours time, but it is stronglyrecommended where eggs are taken in small quantities. A number ofjars manipulated in this way hatched over 85 per cent, the best per-cen
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