494 



Jon. HrNiî. Eklöf 



Tab. XL; 



Siiiiiiiiam dciiide Qiiadralonun dilFcreniiamin, in TaLL. XIP, XXXVII, 

 XXXVIII, XXXIX cl XL olncnlcnliuni, in scf^. Tal). XLI exposuiiuus. 



