Molecular Dynamics of a Crystal. 



151 



from the Boscovich curve representative of /(D) a table of 

 values of P, and plotting them on a curve, by formula (8) , 

 for values of a from a=I (the limit above which the force is 

 zero for all distances) downwards to the value which makes 

 P= -co , or to zero if there is no infinite repulsion. The 





< g 









' 







m 





\ < * 



> 





V* 





o* 



be 



CM 

 << 







o 



s, 



» *-i 



accompanying diagram, fig. 6, copied from fig. 1 of Boscovich's 

 great book *, with slight modifications (including positive 

 instead of negative ordinates to indicate attraction) to suit 



* Theoria Philosophise Naturalis redacta ad unicani legem viiium in 

 natura existentium, auctore P. Rogerio Josepho Boscovich, Societatis 

 Jesu, nunc ab ipso perpolila, et aucta, ac a plurimis prsecedentium 

 editionum mendis expurgata. Editio Veneta prima ipso auctore praesente, 

 et corrigente. Venetiis, MDCCLXIII. Ex Typographia Remondiniana 

 superiorum permissu, ac prtvilegio. 



