The bottom shell of the Barnacle like a Limpet, at _Fig._ 18. increases from a small point by many thin shelly margins, which exactly correspond to the indentations which we observe on the base of the outward shell; so that it appears not unlike the drawing of a fortification in miniature. I am, Dear Sir, Your most affectionate Friend, John Ellis. _P. S._ The Rev. Mr. William Borlase is now of opinion, that the Cornish Barnacle at _Fig._ 16. which he has described in his History of Cornwall, is rather a Limpet or Patella. CXIV. _A further Account of the poisonous Effects of the_ Oenanthe Aquatica Succo viroso crocante _of_ Lobel, _or_ Hemlock Dropwort, _by_ W. Watson, _M.D. F.R.S._ _To the_ ROYAL SOCIETY. [Read Dec. 21, 1758.] Gentlemen, IN the month of June 1746. I communicated to you some observations concerning the _Oenanthe aquatica Succo viroso crocante_ of Lobel, in relation to its poisonous effects upon some French prisoners at Pembroke. These observations were afterwards published in the _Philosophical Transactions_[225], with an accurate representation of the plant itself, from an original drawing by that compleat artist Mr. Ehret. This at that time I thought the more necessary, as it was of no small importance to the public, to be well acquainted with a plant, the effects of which, when taken into our bodies, were so much to be dreaded. This account of mine, as well as the representation of the plant, were republished from the Transactions into the periodical works of that time; from whence a more extensive knowlege of and acquaintance with this plant might have been hoped for. A late instance however has evinced, that these endeavours have not had their full effect, as the plant in question is not yet sufficiently known, and attended to. John Midlane, a cabinet-maker of Havant in Hampshire, aged about 58, and of a gross habit of body, was advised to make use of the water parsnep, as a remedy for a severe scorbutic disorder, which he had long been troubled with; and for which he had taken a variety of medicines. Instead of the water parsnep, which he purposed to take, there were gathered for him some roots of the _oenanthe_ above mentioned; a large one of which was pounded in a mortar, and the juice thereof squeezed through a linen cloth, and amounted to about five spoonfuls. This was suffered to stand all night, and the next morning (Mar. 31. 1758.), at about half an hour past five, he drank the whole quantity, except the sediment.