The Cork Constitution says:—"it is worth while to investigate in time, if indeed it be yet in time, the cause of that decline in the quality of our butter which is rendering so unsaleable.  Newfoundland is gone—South America is going—and even the West Indies are looking elsewhere for supplies.   The greater quantity of salt employed in Continental butter can scarcely be the reason of the preference other latter obtains, for that has always been the case, and would have affected us formerly as well as now.   It is not worth the agriculturist's while to inquire whether turnip-feeding may not have something to do with it?  and whether his gain in that way is worth the loss which he must anticipate from the closing of the markets in which his butter has hitherto been accustomed to find sale?