172 Mr Hart an Heating Apartments. 



magno, carnoso, hippocrepico, papilloso-glauduloso imposiUs: valvulis margine 

 inflexis, demum solutis, interiore parim breviore. Stylus fusiformis, glaber. 

 Stigma obtusissimum, leviter bilobum : lobis margine revolutis, minute papil- 

 loso-pruinosis. Ovarium placentis 2 parietalibus, magnis, carnosis, seminiferis, 

 subinde intervallo distinctis, unUoculare. 



The previous description having been taken from dried speci- 

 mens it will be found to contain some inaccuracies, which are 

 now corrected, from an inspection of the living plant. 



Description of an Economical Apparatus for Heating Apart- 

 ments. By John Hart, Esq. Communicated by the 

 Author. 



J.K this climate, where we must frequently have recourse to 

 artificial heat, in order to keep up a proper temperature in 

 our buildings, no plan seems to answer so well, both for the 

 purposes of ventilation and heat, as that of introducing a copi- 

 ous stream of moderately heated air, by means of a well con- 

 structed cockle, especially for heating large houses, churches, or 

 other public buildings. But as a cockle is very expensive, and 

 requires a considerable space for its erection, any plan of econo- 

 mizino- either must be acceptable to your readers. "With this 

 view, therefore, I send for insertion in your Journal,5the de- 

 scription of an apparatus of this kind I got erected last year, for 

 heatino- the Library and Apparatus Rooms of the Andersonian 

 University, the cost of which was only about one-fourth the 

 price of a cockle of the same heating power. 



The space in the ground-floor being rather narrow to contain 

 a cockle of sufficient size, it occurred to me, that a few cast- 

 iron pipes, built into a furnace (after the manner of retorts in 

 the ovens of the gas-works), would answer the purpose of a 

 cockle, by simply causing the external air to pass through the 

 heated tubes. I accordingly procured six cast-iron pipes of 

 seven inches diameter, and nine feet long (gas mains cast with- 

 out sockets), and had them built up after the manner shewn in the 

 Plate III. ; by this arrangement, I obtained about eighty super- 

 ficial feet of surface, exposed to the heat, or, heating surface, 

 equal to a cockle of four feet cube. 



