76 On Heating Buildings ly Steam. 



did not smell so strong, and its colour, was much redder 

 when cut into. 



Piire Hydiogen Gas obtained from the Vapoiirs of Watery 

 passed over red-hot iron. Over Mercury. 



Istdav, (April 3), The meat became ot a crimson red. 

 2d to the 3 lit day. No other change could De observed than 

 that the mea» became a little brown, hut it had not a livid 

 colour. It is remarkable tiiat this meat preserved its red 

 colour and retained an appearance of freshness, while the 

 pieces put into the oxvgen gas and atmospheric air grew 

 pale. When it was taken out of the receiver, it had not 

 the least smell. The gas at the end of the experiment ren- 

 dered lime water turbid. 



Pure Hydrogen Gas, ifi a Bottle with a Cork Stopper. 



From the 1st to the 51st day the meat was not in the 

 least brown, it preserved its colour, and only appeared a 

 little moist. When taken out on the 51st day it had not 

 the least bad odour; its smell sometbiiig resembled that of 

 smoked meat, Tlie gas tried by nitrous air was not sensi- 

 bly diminished, it rendered lime-waler slightly turbid, and 

 afterwards burned with great vivacity. 



[To be continued.] 



XVI. On Heating Buildings by Steam. 

 To Mr. Tilloch, 



Dear Sir, JjIaving frequently troubled you on the sub- 

 ject of heating buildings by steam, I beg leave to mention 

 that considerable progrei-s has been made in it since 

 the publication of my Essay on Fuel, and since I last 

 ■wrote to you. A place of worship has been for a con^ider- 

 able time heated by steam on a most simple plan, so as to 

 require little or no attendance, and does not require any 

 water whatever to be added to that first put into the boiler 

 above thrice in a winter. This is a7i important fact, and 

 so is the following. 



Ihavc seeii an')lher mode, by which a fire of three hours 

 in the morning serves for Heating the whole of the rest of 

 the day. This docs away the ol)icction to the use of steam 

 as formerly applied for many purposes, such as hothouses, 

 &;c. and is an mtroduction of a 7ieiv principle, if I may use 

 the expression, From wliich in)i)orianl piactical beiielJts may 

 arise. I am your most obedient, 



Robertson Buchanan, 



Civil EngMH-cr, Glasj^^ov,-. 



XV 11. Fro- 



