The sulphur-wort, or "sea hog's-fennel," for instance, is not especially attractive--a big coarse plant, five feet in stature, with a solid stem, uncouth masses of grass-like leaves, and large umbels of yellow flowers--yet I have a gratifying recollection of a visit which I once paid to its haunts on the Essex salt marshes near Hamford Water. Again, the twisted-podded whitlow-grass is a rather shabby-looking little crucifer; but the day when I found it under the crags of Snowdon in Cwm Glas stands out distinguished and unforgotten. It is natural that we should observe more closely what there are fewer opportunities of observing. Let me speak first of the barren days. An old friend of mine who is of an optimistic temperament once assured me for my comfort, that the flower-seeker must not feel discouraged if he fail in his pursuit; since it is not from mere success, but from the effort itself, that benefit is derived. The text should run, not "Seek, and ye shall find," but, "Seek, and ye shall not _need_ to find." This may be a true doctrine, but it seems rather a hard one; certainly it is not easy, at the time, to regard with entire complacency the result of a blank day; and that there will be blank days is beyond doubt, for it is strange how long some of the "wanted" plants, the De Wets of the floral world, will evade discovery. I have looked into the face of many hundreds of star-saxifrages on the hills of Wales and Cumberland, but have never yet set eyes upon its rare sister, the snow or "clustered" saxifrage. In like manner among the innumerable flowers of the chalk fields, in the South, that elusive little annual, the mouse-tail, has hitherto remained undetected. So, too, with many other rarities: the list of the found may increase year by year, but that of the _un_found is never exhausted. It is well that it is so, and that satiety cannot chill the ardour of the flower-lover, but like Ulysses, "always roaming with a hungry heart," he has ever before him an object for his pursuit. "Wretched is he," says Rousseau, "who has nothing left to wish for." Nor is the reward a merely figurative one, such as that of the husbandmen in the fable, who, after digging the ground in search of a buried treasure, were otherwise recompensed; for the lean days are happily interspersed with the fat days, and to the botanist there is surely no joy on earth like that of discovering a flower that is new to him; it is a thrilling event which compensates tenfold for all the failures of the past.