227 
Moses Platt. This machine, which was patented in 1743, 
consists of three “bowls” mounted on a frame, one behind 
the other. Over each bowl is placed an engraved printing 
roller, and above the rollers are placed feeding rollers for the 
colour, which by their accuracy of fit and weight act also as 
“doctors.” In 1783, Thomas Bell laid the foundation of 
cylinder printing, in which a most important improvement 
was effected in 1796 by William Paul of Manchester, by the 
introduction of the adjusting wheel, now called the “box 
wheel.” In 1806, Joseph Bramah invented his composite 
roller, by which the designs which are engraved upon it may 
be transposed at pleasure, and by which several colours may 
be printed by one roller. 
Professor Roscoe made a communication to the Society 
concerning the alleged practice of arsenic eating in Styria. 
He stated that his object was to settle the long debated 
question as to tbe possibility of the human body being able 
to accustom itself to doses of arsenic, as it is known to be 
able to do to doses of opium, alcohol, and other substances 
taken in quantities, which under ordinary circumstances 
would produce fatal effects. The statement that the peasants 
of Styria are in the habit of taking doses of arsenic, which 
would to ordinary persons prove fatal, seems to originate with 
Von Tschudi. Professor Taylor, in his work on Poisons, 
places discredit on Von Tschudi’s statements, but gives no 
positive proof concerning the matter. Dr. Roscoe had ob- 
tained much information on the subject direct from Styria, 
through his friend Professor Von Pebal of Lemberg, and the 
subject was now mentioned simply to call the attention of the 
members of the Society to the question, and if possible to 
obtain further definite information. Dr. Roscoe did not 
venture to express any opinion on the subject at jiresent ; he 
hoped before long to receive conclusive evidence from a 
circular addressed to the medical men of Styria, the results 
