"Student" inquires " whether the Mistletoe is found on the Oak in this country, as it is never found on the Oak in the Old World ?"

[The fact is the Mistletoe has been found on the Oak in a few rare cases in England of late years, and there is evidence that it was one of the most common occurrences in Druidical times - 2000 or more years ago. The great probability is that the Mistletoe has no objection to any tree, and its occurrence on particular trees in particular places or particular centuries depends on climatal causes. In Texas our Mistletoe is found chiefly on the Mesquit; in Virginia and North Carolina on the Elm; in Delaware and Maryland on the Persimmon; in Canada on the Poplar.

It probably requires peculiar climatic conditions at the germinating season, and these conditions can be made more effective on certain trees than on others. Some trees will better aid these climatic conditions than others, and if climate changes in any one place, another kind of tree will then favor the conditions better than the one which formerly filled the post of assistant to nature. Now climates must of necessity change, and the climate of Great Britain cannot possibly be the same as it was when the Druids cut the Mistletoe from the Oak trees; and with the climatic change there will naturally be a change of tree by the Mistletoe to suit the new conditions.