Mrs. M. R., Mt. Pleasant. Iowa, says: "I would like to enquire the cause of what I am told florists call ' honey dew,' a shiny substance, sticky, that comes on leaves; and the remedy".

[In many cases "honey dew" is simply the sweet excretions of aphides, or perhaps other plant lice. But there are some cases wherein it is clear no insects have had any agency in the matter, and these cases are supposed to be due to sweet exudations from the leaves themselves-just as sugar is formed in the sap of the sugar maple during the winter season. But just how the plant does it has not been made known that we are aware of. - Ed. G. M].