284 Proceedings of the Royal Institution. 
Lecture VIII. Murch 27. a 
Hypothetical Views in reference to the relation subsisting between 
heat, light, electricity, and magnetism. Usually received Theories 
of light and heat—their insufficiency. Of the Calorimotor and Mag- 
netomotor. Electricity considered as a chemical agent. Early ex- 
periments of Nicholson, Carlisle, and Cruickshank. Series of expe- 
riments in illustration of Sir H. Davy’s discoveries, commencing with 
those respecting the source of acid and alkaline matter in water, and 
terminating with the discovery of the nature of the Earths, fixed alka- 
lies, and other substances. His application of a negative power to 
the prevention of the corrosion of the copper sheathing of ships. 
Lecture IX. 4pril 3. 
Of the Electro-magnetic Discoveries of M. CEirsted. Positions 
assumed by magnets is respect to wires transmitting electrical currents 
in different directions. Dr. Wollaston’s hypothesis of the cause of 
these phenomena explained by experiments and models. All metals 
susceptible of magnetism, but no other substances. Effect of Spirals. 
M. Ampere’s experiments and apparatus. Modes of conferring 
permanent magnetism upon steel bars. Mr. Faraday’s inquiries con- 
nected with this subject—first effects electro-magnetic rotation—his 
apparatus. Various means of exhibiting electro-magnetic rotations 
Conclusion of the Course. 
Sy3LbLaBus oF a Course or LecturzEs ON Botany. 
By Mr, Frost. 
Lecture I. Wednesday, May 26. 
Introductory Remarks on Vegetable Physiology. The Analogy be- 
tween Plants and Animals considered. Definition of a Plant. Ob- 
servations on the Textures and Vessels of which it is constituted. 
Examination of the component parts of the Trunk, viz., the Epi- 
dermis, the Cortex, the Liber, the Alburnum, the Wood, and the 
Medulla. 
Lecture If. Wednesday, June 2. 
Consideration of the Sap and the Juices of Plants, The effects of 
