EEPORT OF COMMISSIONER OF FISH AND FISHERIES. LXXV 



examinatiou showed that the fry were not injured by being passed 

 through the pipe. When the vessel arrived on the i)lanting grounds 

 a section of hose about 10 feet long was attached to the bottom of the 

 tank and the fry were allowed to pass overboard through it. By placing 

 the end of the hose under the surface of the water uo possible injury 

 could result. 



The following gives the temperature of air and water at the station 

 during the year : 



Month. 



1898. 

 July . . . 

 Aug . . . 

 Sept . . . 

 Oct.... 

 Kov . . . 

 Dec... 



Water. 



Mean. Max, 



- I 



°F. 

 77 

 76 

 69.3 

 51 

 39.76 



°F. 



84 



79 



77.5 



74 



50 



Min. 



Mean. 



°F. 



70 



73 



65 



47 



37 



°F. 

 76 



76.2 

 69.83 

 58.6 

 43.13 



28 85 I 36 ! 32. 5 ! 33. 22 



Month. 



Air. 



Water. 



Max. 



1899. 



Jan 



Feb 



Mar 



Apr ... . 



May 



June . . . 



°F. 

 49 

 53 

 50 

 85 

 81 

 90 



Min. Mean. Max. Min. Mean 



°F. 

 — 

 —11 

 18 

 27 

 52 

 60 



OF. 

 26 75 

 21 79 

 32. 61 

 49.53 

 62.41 

 73.23 



°F. 



32.5 



32.5 



35 



58 



65 



75 



°F. 



32.5 



32.5 



32.5 



33 



54 



62 



op 



32.5 



32.5 



33.59 



42. 27 



58. 82 



68.7 



On March 12 a field of ice gorged at the point where the west intake 

 pipe enters the lake and carried away 20 feet of the 10-inch suction 



pil)e. On May 30 the storehouse of the 

 station and its contents were burned 

 Spontaneous combustion is supposed to 

 have been the cause of the fire. The 

 loss amounted to about $438. 



Experiments have been conducted for 

 a number of years with the purpose of 

 designing a jar better adapted for the 

 white-fish and pike-perch work than the 

 McDonald jar. One designed by the 

 superintendent and manufactured by 

 Dorfiinger & Sons, of White Mills, Pa., 

 was used this season along with the old 

 jars, and from the results attained it is 

 believed it will be an improvement over 

 the old form. It is of glass, 15^ inches 

 high and 7 inches in diameter, with a 

 glass spout, thus eliminating the old 

 metal spout, which had to be attached to 

 the jar by rubber gaskets, putty, oi 

 cement. The bottom is 5 inches in diam- 

 eter and rests directly on the shelf, obvi 

 ating the necessity for glass legs, Avhich are apt to break. It works 

 well with 5 quarts of eggs, using less water than the McDonald jar, and 

 by filling the jar to within an inch of the top it acts automatically, all 

 fungused eggs being carried over into the receiving-trough by the cur- 

 rent of water. They are prevented from entering the lower row of jars 

 by wire-cloth pockets inserted in tlie outlet of the discharge trough. 

 The water enters the jar throagli a steel tube with a trumpet-shaped 



White-fish hatching jax designed 

 by J. J. Sti'iiuahan, 



