1803.] THE EOYAL INSTITUTION. 219 



On November 24 Mr. Dalton wrote to Mr. Savage, 

 the clerk : 



RESPECTED FRIEXD, As it will not be convenient to me 

 to be in town before the 17th or 18th of next month, I 

 should be glad to know previously whether my accommo- 

 dation as to board and lodging would be in the Institution ; 

 if not, whether you know of any place in the vicinity where 

 the same would probably be procured. It will be necessary 

 for me to spend a considerable portion of time to make 

 myself acquainted with the structure and use of some of 

 the apparatus, and therefore I am the more solicitous on the 

 above heads. Pray, what is the usual duration of a lecture 

 one or two hours ? An immediate reply to these inquiries 

 will much oblige, 



Yours respectfully, 



J. DALTON. 



Apartments were ordered by the managers to be 

 prepared in the house for Mr. Dalton before December 

 17. 



On Monday, December 22, at two, he gave the intro- 

 duction to a course of four lectures on Mechanics and 

 Physics. In this lecture he dwelt on the objects of 

 natural philosophy, division of the science, utility 

 of the study, plan of the lectures. The second lecture 

 was on Monday, 26, at eight P.M., on the Properties of 

 Matter ; extension, impenetrability, divisibility, inertia, 

 various species of attraction and repulsion, motion, 

 forces, composition of forces, collision, pendulums. 

 The third lecture was on Wednesday, 28, at two. Pro- 

 jectiles ; resistance of the air, mechanic powers, strength 

 of timber. The fourth on Thursday, at two. Pneu- 



