536' 



LONGEVITY LONGINUS. 



LONGIMETRY ; the measuring of lengths or 

 distances, both accessible and inaccessible. Acces- 

 sible distances are measured by the application of 

 some measure a certain number of times, as a foot, 

 chain, &c. And inaccessible distances are measured 

 by taking angles, &c., by means of proper instru- 

 ments, as the circumferentor , quadrant, theodolite, 

 &c. This embraces a great number of cases, ac- 

 cording to the situation of the object and observer. 



LONGINUS, CASSIUS ; a Platonic philosopher and 



celebrated rhetorician of the middle of the third 

 century, A. D. According to some accounts, he was 

 born at Emesa, in Syria ; according to Ruhnken, 

 Athens was his birth-place. Greek literature was 

 the principal subject of his studies. At Alexandria, 

 Athens, etc., he attended the lectures of the most 

 distinguished scholars. He studied the Stoic and 

 Peripatetic systems of philosophy, but subsequently 

 became an ardent adherent of the Platonic, and an- 

 nually celebrated the birth-day of its founder, by a 



