588 PHILOSOPHICAL TRANSACTIONS. [aNNO 1/33. 



opium ; for if it impedes the secretion of the animal spirits, the immediate 

 active instruments of all sensation, it must certainly obtund or abolish for that 

 time the disagreeable sensation of pain. 



The third difficulty is, how pus should be the product of chyle, and not of 

 the blood or serum. As to which, Dr. S. thinks it would not be difficult to 

 prove that all the gross secretions are from the chyle ; these being only the 

 depurations of it in sanguification, or in order to bring that crude and gross 

 fluid the chyle into pure and defecated blood, from which no secretion can after- 

 wards be made, but of that purest fluid, which it secretes into the nerves for 

 the use of the whole economy. 



If this be true, then pus in a wound, ulcer, or impostume, being a very 

 gross feculent humour, is likelier to issue from the chyle, than from the purer 

 and more defecated part of the mass. 



A Catalogue of Eclipses of Jupiter s Satellites for the Year 1734. By James 

 Hodgson, F. R. S. Master of the Royal Mathematical School at Christ's 

 Hospital, London. N° 427, P- 26. 



Calculated for the use of persons intending to observe them that year. 



Of the Flying Squirrel, or Mus Ponticus or Scythicus of Gesner; and of the 

 Fespertilio admirahilis Bontii. By M. Klein.* N° 427, P- 32. Abridged 

 from the Latin. 



There is a peculiar kind of flying lizard, under the name of lacertus volans 

 or dracunculus alatus, very common in Java. Beionius represents it as a biped; 

 but this is deservedly contradicted by Piso and others; and indeed the dracunculi 

 preserved in several museums, abundantly confirm their being quadrupeds. 

 Quadrupeds are properly called flying, which really fly, that is, roam about 

 freely in the air; but those are improperly said to fly which live generally in 

 trees, as the common squirrels, and other animals of that kind, martens, &c. 



Among these, the principal is the flying squirrel, so called, as it is provided 

 with a kind of sail, or peculiar flying instrument. M. Klein finds one of them 

 in Levinus Vincentius's Catal. and Descript. Animal. 172(3, under the name of 

 sciurus virginiensis volans, without any further description of it. He finds 



* Of the animals mentioned in this paper by Klein, the first is the sciurus volans of Linnaeus ; 

 the European Jiijing squirrel of Pennant, &c. It is a native of the northern parts of Europe and 

 Asia. The other animal, the vespertilio admirahilis of Bontius, is the lemur volans of Linnaeus ; the 

 flying macauco of Pennant, &c. and the gakopithecus of Pallas. It is a native of Ceylon, Java, and 

 other East-Indian islands. 



