§ 3. To simplify lalei' calciilalioiis 1 havo calculaled for llio 

 isolliornials r, f, ƒ/. //, /. /•. / ihe values ot'y>/- for re,uiilarh- iucreasiuü' 



(Icusilios I - J. Tlierolor each value has heeu inlorpolaled IVoin 4 poiuls 



derived direelly frou) observation; oidy for llie e.xireuie \alues we 

 have iuler|)olale(l i)el\veen I] |>oiuts\'. So wv \\]\(\ the \alues ,ui\-eii 



^) For lliis wc u.«:cd the formula oi' L.vciR.vNGK, which may he easily writ ten in 

 the following- form: 



'f—'K , ('/—'/.,) (<l—cL) ((f—<L) 



wiiore 



(,/_,/,) (</-(/J (</~<L) 



''.■? — ''•' 



'',— ''■2 



1 



P rrprcsonts pr, while is ropresentrd hy (/. Suppo.^ing Dial d lies liolweeii 



d.2 and f/;.,, ilic Iwn \:\>\ terms of /' her-ome relatively small and llicy may he 

 easily calcnlatcii witli a slidim;-ndr. 



