Calceolaria.
Linaria vulgaris.
Verbascum thapsus.
Vandellia nummularifolia.
Cleistogene flowers.
Gesneria pendulina.
Salvia coccinea.
Origanum vulgare, great increase of the crossed plants by stolons.
Thunbergia alata.

In the family of the Scrophulariaceae I experimented on species in the
six following genera: Mimulus, Digitalis, Calceolaria, Linaria,
Verbascum, and Vandellia.

[3/2. SCROPHULARIACEAE.--Mimulus luteus.

The plants which I raised from purchased seed varied greatly in the
colour of their flowers, so that hardly two individuals were quite
alike; the corolla being of all shades of yellow, with the most
diversified blotches of purple, crimson, orange, and coppery brown. But
these plants differed in no other respect. (3/1. I sent several
specimens with variously coloured flowers to Kew, and Dr. Hooker informs
me that they all consisted of Mimulus luteus. The flowers with much red
have been named by horticulturists as var. Youngiana.) The flowers are
evidently well adapted for fertilisation by the agency of insects; and
in the case of a closely allied species, Mimulus rosea, I have watched
bees entering the flowers, thus getting their backs well dusted with
pollen; and when they entered another flower the pollen was licked off
their backs by the two-lipped stigma, the lips of which are irritable
and close like a forceps on the pollen-grains. If no pollen is enclosed