196 



NOTES AND MEMORANDA. 



crowded with eggs not quite ripe. It appears, therefore, that in 

 these soles the eggs, when nearly ripe, escaped in successive lots 

 into the cavity of the ovary, and there died an(^ degenerated. It 

 is evident that soles will not spawn in our tanks. These specimens 

 had been living in the same tank since the summer of 1889, and 

 they showed no signs of spawning in 1890. Whether the cause of 

 this inability to breed is merely the confinement, or the shallowness 

 of the water in a tank compared to the depth of the sea, or the 

 quality of the water, there is at present no evidence to show. — 

 J. T. C. 



The Amount of Fat in DiiFerent Fishes. — An inquiry has recently 

 been made concerning the above, and in consequence of this I have 

 made a number of determinations of the amount of fat in the flesh or 

 muscle of various species. The fat was extracted with ether in a 

 fat extraction apparatus ; the ethereal solution thus obtained was 

 separated from any water which happened to be present, and dried 

 over calcium chloride. The ether was then distilled off, and after 

 being heated to 100° C. the residue was weighed. The following 

 table gives the results obtained : 



F. Hughes. 



ERRATUM. 



In Mr. Cunningham's paper in the previous number of the 

 Journal, p. 17, line 25, /or 6 lbs. read 2 lbs. 



