^8 Mr. J. Hogg on the Ballast-Flora of of fecundation in the Floridese differ widely from those hitherto known to occur in the Algae. The structure of the organs, their mode of action, the period at which their functions are performed, and the effects which they produce present important differ-ences related to those which distinguish the Floridese from the other Hydrophytes. We no longer find in this case a direct action of the antherozoids upon the reproductive bodies : the operation is less simple, and in some respects presents some resemblance to that occurring in the higher plants ; for we see in the same way a fecundation produced by immobile corpuscles upon an external organ, and having as its result the determination of a complete development of the apparatus of fructification. IX. — On the Ballast-Flora of the Coasts of Durham and North-umberland. By John Hogg, M.A., F.R.S., F.L.S. &c* In this short paper I beg to offer to botanists a few remarks on the plants which have been introduced with ballast by ships on the coasts of Durham and Northumberland, This interesting subject has already received some attention from our practical and field-working botanists, namely the late Mr. Winch, the late Mr. Storey, the Kev. A. M. Norman, and Mr. M.A. Lawson, who have all published, in the 'Transactions of the Natural-History Society of Newcastle-on-Tyne,^ and in those of the Naturalists^ Field-Club, some lists of the rare plants which they found growing on the ballast-hills in their own vi-cinity. I have been able, from an acquaintance of some years with the ballast-districts of the county of Durham, to add several rarer species to those lists which were formed by the botanists whom I have already mentioned. The extent of the two counties to which I have now limited myself comprises the sea-coasts and chiefiy the banks of the rivers Tees, Wear, and Tyne : of the latter are the great ballast-deposits at Port Clarence and those at West Hartlepool, at East Hartlepool, and the embankment of the railway to the north of the latter town, the mounds of ballast at Seaham, at Sunder-land, and near Wearmouth, as well as those at South and North Shields, and others along the Tyne nearer to Newcastle. In the following lists of species I shall only divide them into two heads or divisions, viz., the first, those plants which are exotics or foreign to our island, and, the second, those more scarce indigenous and naturalized plants of Great Britain which were rarely seen, if not entirely unknown, in the before-named portions of England. * Communicated by the Author, having been read before the Section Biology at the British Association Meetings held at Nottingham, August 28. 1866.
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