M.R.I., Member of the Royal Institution. M.R.I.A., Member of the Royal Irish Academy. MS., Manuscript. MSS., Manuscripts. Mus. Doc., Doctor of Music. N.B., Mark well. Nem. con., Without opposition. O.H.M.S., On Her Majesty’s service. Op. cit., The work quoted. Per cent. (often expressed by the sign %), By the hundred. Ph.D., Doctor of Philosophy. P.M., Afternoon. Prox., The next (month). P.S., Postscript. Q.C., Queen’s Counsel. Qy. (?), Query, Question. R.A., Royal Academician——Royal Artillery. R.E., Royal Engineers. R.H.A., Royal Horse Artillery. R.M., Royal Marines. R.N., Royal Navy. Tr., Translator. Ult., The last (month). v. or vide, See. W.S., Writer to the Signet. &, _ampersand_, and. &c., et cetera, And so on. 2. Abbreviations used in Prescriptions:—— _A. aa._, _ana_ (Greek), of each. Equally by weight or measure. _Abdom._, _abdomen_, the abdomen, the belly. _Abs. febr._, _absente febre_, fever being absent. _Ad 2 vic._, _ad secundum vicem_, to the second time; or _ad duas vices_, for two times. _Ad gr. acid._, _ad gratam aciditatem_, to an agreeable acidity. _Ad def. animi_, _ad defectionem animi_, to fainting. _Ad del. an._, _ad deliquium animi_, to fainting. _Ad libit._, _ad libitum_, at pleasure. _Add._, _adde_, or _addantur_, add, or let them be added; _addendus_, to be added. _Adjac._, _adjacens_, adjacent. _Admov._, _admove_, _admoveatur_, _admoveantur_, apply, let it be applied, let them be applied. _Ads. febre_, _adstante febre_, while the fever is present. _Alter. hor._, _alternis horis_, every other hour. _Alvo adstr._, _alvo adstrictâ_, when the bowels are confined. _Aq. astr._, _aqua astricta_, frozen water. _Aq. bull._, _aqua bulliens_, boiling water. _Aq. com._, _aqua communis_, common water. _Aq. fluv._, _aqua fluviatilis_, river water. _Aq. mar._, _aqua marina_, sea water. _Aq. niv._, _aqua nivalis_, snow water. _Aq. pluv._, _aqua pluviatilis_, or pluvialis, rain water. _Aq. ferv._, _aqua fervens_, hot water. _Aq. font._, _aqua fontana_, or _aqua fontis_, spring water. _Bis ind._, _bis in dies_, twice a day. _Bib._, _bibe_, drink. _BB._, _Bbds._, _Barbadensis_, Barbadoes, as _aloë Barbadensis_. _B.M._, _balneum mariæ_, or _balneum maris_, a warm-water bath. _B. P._, or _B. Ph._, British Pharmacopœia. _But._, _butyrum_, butter. _B.V._, _balneum vaporis_, a vapour bath. _Cærul._, _cæruleus_, blue. _Cap._, _capiat_, let him (or her) take. _Calom._, _calomelas_, calomel, subchloride of mercury. _C. C._, _cornu cervi_, hartshorn; it may also signify cucurbitula cruenta, the cupping-glass with scarificator. _C.C.U._, _cornu cervi ustum_, burnt hartshorn. _Cochleat._, _cochleatim_, by spoonfuls. _Coch. ampl._, _cochleare amplum_, a large (or table) spoonful; about half a fluid ounce. _Coch. infant._, _cochleare infantis_, a child’s (or tea) spoonful. _Coch.