Manchester Memoirs, Vol. lix. (191 5), No. \%. 13 



Electricity, one on Galvanism, two on Optics, two on 

 Astronomy, and two on Meteorology. 



Tickets for the Course, at One Guinea each, may be 

 had at Messrs. Clarkes', or Mr. E. Thomson's, booksellers ; 

 or at No. 10, George-street. — A Ticket will admit one 

 Gentleman or two Ladies. 



%* Part I of Vol. 2 of the New System of Chemical 

 Philosophy will be published in a few months. 



February 26, 1820. 



A new syllabus for the lectures was prepared and 

 many electrical experiments arranged. The nature of 

 the electrical lectures will be seen from the detailed 

 notes : — 



" Led. 1, 2 & 3. Electricity. Historical sketch of 

 the science — attraction — repulsion — positive and negative 

 electricity — conductors and non-conductors — insulation. 

 Electric machine — theory of its action. Experiments on 

 attraction and repulsion with cork ball — feathers — head 

 of hair — dancing images — musical bells. Different in- 

 fluences of balls and points in attracting the electric 

 fluid — snapping tube. Leyden phial or electric jar — 

 charging and discharging ditto — electric shock. Magic 

 picture. Nature of the electric fluid — compared with 

 light and heat — electric stool — human body a good 

 conductor — jar charged from it. Electric spider — dancing 

 pith-balls. Electrometers — pith-ball — quadrant — Cuth- 

 bertson's — medical — Bennet's gold-leaf. Medical electric- 

 ity — the spark — shock — aura. Paper perforated by the 

 discharge of a jar. Electricity prefers a bad short conductor 

 to a good long one. Inflammation of bodies by electricity — 

 as cotton — spirits — hydrogen gas, &c. — thunder and light- 

 ning — thunder house — conductors. Electric battery — 

 fusing wires, &c. Electrophorus, experiments on it — lumi- 

 nous experiments. 



