49 



He also exhibited a number of models of Tropical 

 fruits, presented to the Museum of Applied Science 

 by Mr, Dadabhoi Naoroji ; and submitted two white 

 Annelides fgen. BorlariaJ, found in one of the graving 

 docks. 



Mr. Alfred Higginson exhibited a piece of charred 

 wood taken from the interior of the cover of a house 

 boiler. An interesting discussion arose out of this on the 

 chemical changes eiFected in vegetable materials by long 

 exposure to steam, and on spontaneous combustion. 



Dr. Inman opened a case of preserved milk, forwarded 

 by J. B. Lloyd, Esq., in whose possession it had been for 

 three years. The process of preservation was that after 

 the Abbe Moigno's, but it had entirely failed, the contents 

 being decomposed. 



The paper of the evening was then read. 

 ON THE COMPOSITION OF ROTATORY MOTION. 



By GEOEGE HAMILTON, F.R.A.S., F.C.S., 



Professok of Chemistry, Queen's College. 



I. PRINCIPLE OF COMPOUND ROTATIONS. 



If a body situated at A (Fig 1) on a plain surface 

 receives an impulse in the direction AB, sufficient to con- 



(not burning always), and perfectly fit for respiration. In a single hour he has been 

 able to raise the temperature in January to 56^ F., and he has generally sustained 

 it at that heat, though he has had it in that month as high as 67° in all parts of the 

 room. One of its greatest advantages has been the entire absence of trouble 

 attending its use, the power of regulating the temperature by turning off the gas at 

 pleasure, and of lighting it during the night when the room might require to be heated. 

 The facility with which tliis gas stove can be fitted up will render it a most im- 

 portant furnishing to the bath-room, as well as to small chambers where fires cannot 

 be conveniently used: and it is not unworthy of remark, that by a simple con- 

 trivance it may be used for laboratory purposes, a flask of water being speedily 

 boiled over it, and evaporation as steadily conducted as may be desired. The 

 discussion which has taken place on the advantages and possible disadvantages of 

 Wessel and Kukla's stove justify these remarks upon its merits. — Editoh. 



7 



