404 . F.toeeedivgs d^ the KoyciL &acietAf. ,: \ 



diate transmission of Radiated Heat," was placed in the' hands 

 of the Secretary, and the reading of it postponed till next 

 meeting. 



t840, Ja«2«//y/ 6. — Sir T. M. Brisbane, Bart. President,- 

 in the Chair. The following Communications were read : — 



1. On the Effect of the Mechanical Texture of Screens on tho 

 ^..immediate Transmission of Radiant Heat. By Professor 

 ^ Forbes, 



2. On the Functions of tlie Roots of the Spinal Nerves in 



corroboration of former observations, proving that the 

 anterior roots are nerves of motion, and the posterior 

 nerves of sensation. By Sir Charles Bell, K.Hi "'I ^J " 



The instance produced was a case wliich had occurred in tlie In- 

 firmary, in which the anterior roots of the nerves arising from the 

 Cauda equina were engaged in a tumonr, and the consequence du- 

 ring life, was the loss of muscular power, sensibility remaining un- 

 affected. 



January 20. — Right Hon. Lord Greenock, V. P. .in the 

 Chair. The following Communications were read : — • 



1. On General Differentiation. Part II. By Professor Kelland. 



2. On the Means employed to prevent Forgeries of Bank 

 . ^^'i- Notes, Bills of Exchange, Cheques, &c. By Dr Traill. 



" The author prefaced his remarks by a short history of Bills of 

 Exchange, and other kinds of paper currency; in which b« pointed 

 out the economy and convenience of a well regulated jac/jaer circulation, 



"The means usually employed to diminish the facilities to for- 

 gery are — 



" 1. Colouring the paper, or the pulp of which it is manufactured, 

 by various vegetable and mineral substances, either singly or com- 

 bined. The best atcempts of this sort have been imitated by a 

 clever hand and a pencil 



" 2. Certain water-marhs in the paper of the note or bill, as that 

 employed by the IBank of Englind. A good imitation of this would 

 perhaps require the conniv.nnce of a paper-maker; but successful 

 imitations of tcater-marks have been made by gum and a pencil, 

 or by pale tints of China ink to imitate a worn note. 



" 3. Printing notes in different colours, from two or more wooden 

 blocks, increases the difficulty of forging; instances of this were 

 given in the coarse Excise paper stamp, and in the more elegant 

 L.1 note formerly issued by the Bankof IrelaiHJIj,;^^;^^,^ oJ ,9TJTa«9m 



