[ ^Z1 ] 



of the figures, would entirely prevent difcovery : — For inftancc, 

 if the Lord Lieutenant wiftied to fend orders to the Commander 

 in Chief, if he made ufe of the numbers written in the vocabu- 

 lary on one day, he might, after previous communication, em- 

 ploy a different numeration, by ordering that i (for inftance) 

 fhould be added to every figure. If clafs II. Number 3664, flood 

 in the vocabulary for gunpowder, by the addition which I have 

 propofed the number would fland, Clafs III. Number 4775, 

 which might mean a Crocodile or Tippo-Saib, or any thing fo- 

 reign to the real word. By fimilar provifions any number of 

 feparate correfpondents might carry on a mutual intercourfe with- 

 out interfering with one another. 



In the courfe of twelve months I tried a great number of ex- 

 periments, and carried on a great number of converfations with 

 the Tellograph ; of all thefe a regular journal has been kept, 

 containing what was unfuccefsful as well as what fucceeded. If 

 fuch journals were kept in the profecution of philofophical pur- 

 fuits, they would pay for the trouble of keeping them by the 

 accuracy of the experience which they enfure. 



I SHALL not at prefent enter into any detail of my nodurrial 

 Tellograph. Its velocity far exceeds what can be done by day, as 

 in clear weather ftations at fifty miles diftance may be plainly 

 diftinguiflied. 



VoL.VL S When 



