Clausula Excerpta, ex Historiâ Variolarum quae per Incisionem Excitantur, ab E. Timoni, M D. Scriptâ, R. S. Communicavit Sam. Horseman, M. D.

quadriennium ex Polonia per Lusatiam & Marchiam huc appellerent, media æstate catervatim alte in arc supra ædes turresque advolasse, ut eminus nubis speciem mentirentur. Quo confederunt loco, ibi terram omnem operuerunt, atque inde longe lateque diffusa fuerunt. De damnis quæ perniciosissimum hoc insectum vicinis Vitembergæ campis editioribus, nam in ipsam vallem prope Vitembergam locustæ non penetrarunt, sed in collibus, qui 1500 circiter passibus geometricis ab hac urbe absunt, substiterunt, & inde ulterius versus Marchiam & Lusatiam processerunt, attulit, ni fallor, in excerptis observationum Anni 1731 retuli. Amabant supremas spicarum molliores cuspides, quæs ut commodius fruerentur, totam spicam immaturam decerpebant, idque noctu inpri- mis fiebat. Una saepè nocte plerasque integri jugeri spicas sic in terram prostratas a locustis suisse fide digni viri mihi confirmarunt, quapropter nonnullis in pagis ne sementem quidem pauperes coloni ex agris suis collegerunt. VI. Clausula excerpta, ex Historiâ Variolarum quæ per Incisionem excitantur, ab E. Timoni, M.D. Scriptâ, R.S. Communicavit Sam. Horseman, M.D. FUIT primò nonnullus qui novaculà cutim scindebat, eique Variolarum includeret tubercula exiccata, factâ desuper ligaturâ: Sed praeter dolorem, quì tamen in pueris reluctantibus multum difficulatis adfert, talis Operatio non bene succedit. Ali- Aliquando enim tardè & cum pessimorum Symptomatum Satellitio erupere variolæ; aliquando incassum cessit Incisio; illa tamen loca Inoculationis ulceribus cacoetheis repleta fuerunt. Nonnullis etiam lethalis fuit talis Operatio: Mumia enim fermentativa, e marcidis istis tuberculis, rancida ac veluti cadaverizata non solum experito scopo haud satisfacit, sed pravam sanguini poteat communicare putrilaginem. VII. An Abstract of a Letter from Petrus Van Muschenbroek, M. D. F. R. S. Professor of Mathematicks and Astronomy in the University of Utrecht, in Holland; to Dr. J. T. Desaguliers, F. R. S. concerning Experiments made on the Indian Magnetick-Sand. S I R, I don't know whether I dare take up your Time with my Trifles; yet I'll venture for once to acquaint you with some things concerning the Indian-Sand, which is attracted by the Loadstone. The Indian-Sand which is brought to Holland, is said to be chiefly gather'd upon the Sea-shore in Persia; then it is boiled in Water, to free it from its Saltnefs, and it is after this a black Powder, consisting of Grains of different Bignefs; some of which have a very rough Surface, and others have one part of their Surface something rough, and the other very shining: Their Figure is very irregular, like Grains of com-