67(^ PHILOSOPHICAL TRANSACTIONS. [aNNO 1712. 



writers on Surgery, is by Nicetas, a physician, of whom it is not known when 

 he lived. It is deposited in N*^ Ixxiv. of the Laurentian Hbrary ; but Spon is 

 not accurate in stating, that the Florentine copy is the only one extant ; for 

 there is another in the library of the King of France. Neither are all the 

 treatises in this collection unpublished tracts, nor are the authors of them un- 

 known. Some of the treatises are entire: of others there are only fragments. 

 It is not necessary (continues Meibomius) to enter into particulars concerning 

 the well-known treatises of Hippocrates, Galen, Oribasius, Rufus the Ephesian, 

 and Palladius ; but of Bithynus, Nymphodorus and Heliodorus, it will be proper 

 to say something. The first of these (Bithynus) was not before known (as 

 Spon observes) even by name; nor was it possible he should, since he never 

 had any existence but in that author's brain. The fragments in the aforesaid 

 collection are from the writings of Asclepiades of Bithynia [Asclepiades Bithynus] 

 of whom Pliny and Galen make frequent mention, and of whom Spon makes 

 two distinct persons, calling the one Asclepiades and the other Bithynus. He 

 might with equal reason have created two persons out of Rufus Ephesius. With 

 regard to Heliodorus, his writings are quoted by TEgineta and Oribasius; and 

 Nymphodorus is noticed by Galen, Celsus, and the aforesaid Oribasius, who 

 make mention of his glossocomon.* Moreover, the eleven chapters of Helio- 

 dorus on Fractures, which are in this collection, have been translated and pub- 

 lished by Vidus Vidius. 



Observations in Natural History^ made in Travels through Wales. By Mr. 

 Edw. Lhwyd, Keeper of the Ashmolean Museum in Oxford. N° 334, p. 462. 



At Snowdon hills we met with little besides what is in Mr. Ray's Synopsis ; 

 only the little bulb I found plentifully in flower; and in one of the lakes I 

 gathered a small plant, which I suspect to be undescribed. I searched diligently 

 in these mountains for figured stones ; but met with none at all, except cubical 

 marcasites, and crystals, one of which is about 9 inches long, and thicker 

 than my wrist, transparent as glass for the better half, but opaque towards the 

 root, like white marble. Some small ones I met with of the colour of a topaz; 

 and was informed of others purely amethystine, found in the valley of Nant 

 Phrantcon. I find that our ancestors, for want of more precious stones, made 

 themselves beads of opaque, or marble crystal. 



Sir William Williams has several Welsh MSS. though I think no Dictionary. 

 They are chiefly modern copies out of Hengwrt study in Meirionydshire, wliich 



♦ Glossocomon or glossocomion, an apparatus somewhat resembling a box, used by the ancients 

 in fractures of the leg or thigh. 



