23o 



THE POPULAR SCIENCE MONTHLY. 



ter as his readings may suggest. The sec- 

 ond part contains sentences from Caesar and 

 Cicero, to which what is learned from the 

 vocabulary may be applied. In the appen- 

 dixes are given tables of the meanings of 

 prepositions in composition, and of the 

 common terminations of words ; exercises 

 on forms ; and rules for translation. 



Telegraphing to and from Railway- 

 Trains : Duplex Telephony. By Dr. 

 A. M. Rosebrugh. Pp. 11. 



These are two papers which were read 

 before the Canadian Institute, discussing 

 the question of the priority of invention of 

 the two processes named. Both inventions 

 are claimed by the author for Canada. 



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