Having obtained a first hybrid generation, he allowed the hybrids to self-fertilize, and recorded the result in a large number of instances (a thousand or more) as to the number of individuals in the first, second, third and fourth generations in which the character selected for experiment made its appearance.
Numerous hybrids have been raised, varying in colour from creamy white to salmon, pink, yellow, red and orange.
Road bikes are pure delight on a decent road surface, much faster than either hybrids or mountain bikes.
There are about twenty species, but the number cannot be very accurately defined - several, usually regarded as distinct, being probably merely variable forms of the same type, and the ease with which the trees intercross has led to the appearance of many hybrids.
Of late years some remarkably fine hybrids have been raised between the various distinct groups of narcissi, and the prices asked for the bulbs in many cases are exceedingly high.