SPONTANEOUS RISE OF HOT LIE IN A PUMP. J 80 



perhaps lead to the solution of some hitherto unexplained 

 phenomena connected with the function of respiration. There 

 can, I think, be little doubt, that the formation of the colouring Formation of 

 matter of the blood is connected with the removal of a portion matter°"""* 

 of carbon and hidrogen from that fluid, and Ihat its various 

 tints are dependent upon such modifications of animal matter, 

 and not, as some have assumed, upon the different states of 

 oxidizement of the iron which it has been supposed to contain. 



IV. 



Remarhalle Effects of the sponta?ieous Rise and Overjiow of 

 heated Soap Lie in a metallic Pimp. In a Letter from 

 R. B. with Remarks hj IF. N. 



To Mr. Nicholson. 

 SIR, 



I WAS much pleased at the sight of your advertisement on Index to the 

 the wrapper of your last number, in which you promise an ^°"^"^ • 

 extensive Index to the whole Journal. I have sent my sub- 

 scription to the publisher ; and, as an old correspondent, who 

 has been your disciple from the very first, I think it incumbent 

 on me to look round for a few philosophical facts, and give my 



assistance to your work as far as ray ability may extend. I won- Philosophy of 

 , , , , , ... . a workshop. 



der that you, who are known to be so mtimately acquainted 



with the practice of all our manufactures, have never given us 

 a detail of what may be called the philosophy of a workshop. 

 In the daily performance of manipulations, and the adoption Introductory 

 of expedients to ensure success, the manufacturer, by the chance '^^"^^'' *• 

 of events, and under the necessity of making repeated trials, 

 is continually, and for the most part unconsciously, avail- 

 ing himself of the tenacities, the toughness, ihe brittleness, the 

 excitement and conducting of heat, the production and conden- 

 sation of elastic fluids, the statical and hydrostatical powers, with 

 the chemical energies of bodies, in such a variety of ways, as 

 would, and often does, afford the most certain instruction to 

 theorists, and not unfrequently the means of improving, in re- 

 turn, the very art under contemplation. I write these reflec- 

 tions as they flow from my pen, and as a kind of preface to a 



fact 



