I notice your comment on my remark that Pru-nus Padus was used in North East Europe for a cherry stock. Possibly I was wrong, yet north of the Carpathians the P. Padus and P. Mahaleb run together in a perplexing way. You will notice that De Candolle speaks of the marked variations of the Padus, and he places it in the same section and sub-section with the Mahaleb. Dr. Koch, of Berlin, places them much the same, and Cosson and others of France place them close together, and say "flowers of Mahaleb in simple erect corymbs odorous,"while Padus has "flowers in drooping cylindrical racemes, odorous." On the East Plain the gardeners call their native wild form "Padus," yet critically it may be Mahaleb. North of the Caucasus I was continually puzzled with the changes of species as found South of the Caucasus and the Carpathians.

We have something of the kind in the inter-continental air of the Mississippi Valley. Catalpa speciosa, box elders, white ash, and red cedar are good examples. We may sow seeds of green ash, as we find it with glabrous shoots, etc., on our creek bottoms, and a part of the seedlings will be glabrous and a part pubescent. Our box elder is hardy in Dakota and Manitoba, and has lately been found hardy at Abbotsford, Canada, and Montreal; your form is with us as tender as a peach tree. It also differs in leaf, flower, character of wood and habit of growth, as does our catalpa. Our native cedar is absolutely hardy on the most exposed northern prairie, while those grown from Tennessee seed are few of days and full of trouble. We have very many questions of this kind of which Menzies spruce from the east and west sides of the Rockies is another example. Agricultural College, Ames, Iowa. [Notwithstanding Professor Budd's illustrations, we should hesitate to accept the proposition that Prunus Mahaleb and Prunus Padus ever run together in any way.

There surely must be a mistake somewhere. - Ed. G. M].