PHILOSOPHICAL TRANSACTIONS. 4Qg 



being so driven out, gets into the space between the two bottoms, as well as 

 into the vessel PP: now the said space, by reason of its size, receiving 20 

 or 30 times more oil than the vessel PP, it follows that the surface of the oi 

 therein rises 20 or 30 times less than if all the oil had been driven into the said 

 vessel. Therefore, when we fill the lamp, we must take care that the pipe L 

 be well closed, so that the air between the two bottoms, finding no vent, may 

 keep the oil from filling that space, which by that means, when the hole L is 

 open, will be fit to receive the oil driven by the rarefaction of the air in th^ 

 cavity AF. Thirdly, the oil being always kept nearly at the same distance from 

 the fiame, the wick will not be quickly consumed. Fourthly, you have the 

 conveniency of putting new oil into the lamp without moving or extinguishing 

 it, only closing up G and L, and pouring the oil through N, as abovesaid. 



Account of a Book, Jo. siphons. Borelli de Motu Animaliurrif published since his 

 Death* Philos, Collect, N° 2, p. 35. 



The work itself is divided into two parts. — ^The 1st of which discourses 

 largely of the conspicuous or visible motions of animals, namely, of the bend- 

 ing, extension, convolution, and progression, of the external parts and joints; 

 and, in fine, of going, flying, swimming, and the like. The 2d, of the causes 

 of the motion of the muscles, and of the internal motions, v. g. of the hu- 

 mours which are made throughthevesselsand viscera of animals: demonstrating 

 by what force, and with what mechanic organs, the parts of animals are moved; 

 afterwards, the manner of the muscles acting ; then of the motive faculty dif- 

 fused through the nerves, by which the muscles are actuated ; then of the 

 internal motions, which do not depend on the command of the will, as the 

 pulsation or beating of the heart, and the circulation of the blood ; of the use 

 of respiration, and of the modes and organs by which it is performed ; of the 

 spirits or nervous juices which give motion and sense, and serve also for the 

 nourishment of the parts; of their motion, and locomotive action; of the ne- 

 cessity of eating, and the cause of concoction and digestion of the food ; of the 

 depuration of the chyle, and of the manner by which nutrition is performed, 

 and the excrements cast out, by the pores, glandules, and kidneys; of the cir- 

 culation of the bile or gall in the abdomen ; of a certain circulation seminis ge-p 

 nitalis; of sleeping and waking; and last of all, of some internal motions that 

 are disturbed and morbid, namely by convulsion, and from lassitudes and fevers. 



The whole work, in 2 vols. 4to. is not yet published, only some parts of what 

 is printed are come to hand, in which, among other things, are contained, 



* He died Christmas last l679, at Rome. See account of his life, vol. i. p. 224-. ^ 



3 s a 



