GENERATION. SECT. XXXIX. 7. 



enlargement of all their parts by apportion of new 

 pai tides. 



Hence the new apportion of parts is not produced 

 by capillary attraction, becaufe the whole is ex- 

 tended ; whereas capillary attraction would rather 

 tend to bring the fides of flexible tubes together, and 

 nut to diilend them. Nor is it produced by che- 

 mical affinities, for then a folution of continuity 

 would fucceed, as when fugar is diffolved in water ; 

 but it is produced by an animal procefs, which is 

 the confequence of irritation, or fenfation ; and 

 which may be termed animal appetency. 



This is further evinced from experiments, which 

 have been instituted to fhew, that a living mufcle of 

 an animal body requires greater force to break it, 

 than a fimilar mufcle of a dead body. Which 

 evinces, that befides the attraction of coheiion, which 

 all- matter poifeffes, and befides the chemical attrac- 

 tions of affinities, which hold many bodies together, 

 there is an animal aciheiion, which adds vigour to 

 thefe common laws of the inanimate world. 



8. At the nativity of the child it depofits the 

 placenta or gills, and by expanding its lungs ac- 

 quires more plentiful oxygenation from the currents 

 of air, which it murt now continue perpetually to 

 refpire to the end of its Hie ; as it now quits the 

 liquid element, in which it was produced, and like 

 'the tadpole, when it changes into a frog, becomes 



an aciial animal. 



9. As the habitable parts of the earth have been, 

 and continue to be, perpetually increafing by the 

 production of fea-fhells and corallines, and by the 

 recrements of other animals, and vegetables ; fo from 

 the beginning of the exiflence of this terraqueous 

 fjlobe, the animals, which inhabit it, have conftant- 

 fy improved, and are dill in a flare of progreffive 

 iajproveinept. 



This 



