10 Furure Boranist. 
fact, that it is not possible to be in two places at the same time. 
I had no hope, therefore, of doing our 900 species in a thorough 
manner, so I have simply studied about 270, with much help from 
Miss Hannay, Mr Armstrong, and others, as well as I could manage. 
The result is that I am firmly convinced that a flower’s shape 
and every detail of colour, scent, mode of ripening, &c., is entirely 
dependent on the insects which carry its pollen. Thus, in the 
order Labiatz of the fourteen species studied, I found bumble-bees 
in every single case, except Mentha arvensis, where I should not 
have expected them. 
Species of Other 
Bombs. Hive Bee. Insects. 
Mentha aquatica vs ae ] es 5a6 a 2 
Mentha arvensis oe Suu) Gack ae re Ba 3 
Thymus serpyllum 1 ] Lag 2 
Calamintha clinopodium 1 
Nepeta Glechoma 1 
Prunella vulgaris 1 
Scutellaria galericulata 2 
Stachys betonica 3 
Stachys silvatica 3 
Stachys palustris 3 1 
Galeopsis Tetrahit 3 2 
Lamium purpureum ] as 
Teucrium Scorodonia .. 3 BEE 1 ee 1 
Ajuga reptans ... 1 os Seis sige 2 
The colour and two-lipped condition are entirely suited to 
these bumble-bees, and this suitability is found in quite minute 
details. 
But it is not safe to draw tables or to generalise in our 
present knowledge of the question. lor mstance, on the common 
bramble I found, with Miss Hamnay’s assistance, the following 
insects—the cabbage white butterfly, hive bee, no less than four 
bumble-bees (B. muscorum, terrestris, Derhamellus and pratorum), 
and only two flies or diptera, and these latter were not common 
sorts, but of a complicated and intelligent type (Eristalis pertinax 
and sericomyia borealis). I should have expected the sort of simple 
and stupid type of fly which one finds, eg., on the strawberry, to 
which the bramble flower is not so very different. The bramble 
enjoys this select set of visitors, probably because the flowers 
appear so late in the season that these bees are not tempted to 
visit other forms, but no one would have expected such a result. 
In spite of the vast amount of observation yet required, it is safe 
