VOL. XLI.] PHILOSOPHICAL TRANSACTIONS. 513 



every thing is rectified for that time, and its phenomena may be col- 

 lected. 



Now the horary motion of the moon from the sun being taken from the 

 tables, it will be, as the moon's horizontal parallax, is to her horary motion, 

 so is the number of the parts of the plate efg, which answer to the semidi- 

 ameter of the globe, above found, to the quadrant which shows how many 

 parts, on turning the plate round, are to be drawn through the place of the 

 index, to have the situation of the disk of the penumbra, an hour before or 

 after the time which answers to the primary situation. The disk therefore 

 being brought to this place, and the globe turned on the axis, the phenomena 

 of this time may be had in like manner. 



The places marked on the surface of the globe, lying perpendicularly under 

 the disk of the penumbra, in any situation of it, may be found by the pendu- 

 lum. But they are seen at one view, when the whole apparatus is exposed to 

 the sun's rays reflected from a plain speculum, in such a manner, that the rays 

 may fall perpendicularly on the horizon of the globe. For then such shadows 

 will be projected from the disk of the penumbra, on the globe, as are like the 

 penumbrae cast on the earth by the moon, by which may be seen the phases of 

 the eclipse for any place. 



But this motion of the sun is inconvenient. Perhaps those who have a large 

 burning-glass will make use of a lamp, the rays of which may be thrown on the 

 globe from the glass, in a position perpendicular to its horizon. Otherwise, 

 by viewing the globe from a distance through a perspective glass, then the 

 disk klm, being brought on the surface of the globe, exhibits the penumbra. 

 Various other contrivances may also be devised, for exhibiting the several phases 

 of the eclipses. 



Samuelis Christiani Hollmanni, Logic, et Metaph. in nova Gottingensi Academia 

 P. P.O. Observatio de Sceletorum, ex Foliis virentibus paratorum, quorum- 

 cunque Duplicatura. N°46l, p. 789. 



Samuelis Christiani Hollmanni, Logic, et Metaph. in nova Gottingensi Academia 

 P. P. 0. de Duplicaturee Fibrarum, in Foliis quibuscunque conspicuce Usu, 

 aliisque hue pertinentibus. Conjectures. N°46l, p. 79^. 



The observations of Mr. Hollman add nothing of importance to the disco- 

 veries in vegetable anatomy and physiology made by Grew, Malpighi, and 

 others, detailed in the preceding vols, of these Transactions. 



VOL. VIII. 3 U 



