Garde7i Memorandums. 671 



much lower than that which exists in the centre of the dung; but there 

 is a continual transmission of caloric from the centre to the surface, to 

 supply this abstraction of heat at the surface. Now, if a certain portion 

 of the caloric generated in the centre, instead of being transmitted to the 

 surface through the body of the bed, is communicated to the ambient air 

 through tubes, it appears probable to me that a less quantity of the caloric 

 will be transmitted from the place where it is generated, through the body 

 of the bed, to the several points of the surface, and thence to the ambient 

 air, so that precisely the same quantity of caloric will be given off into the 

 air of the frame, whether proceeding, as it does, from the internal part of 

 the bed to the atmosphere of the frame, or transmitted partly through 

 a tube, and partly through the residue of the surface of the bed which 

 remains, after deducting the section of the tube. It would not be a diffi- 

 cult experiment to place a thermometer in the hotbed, and, after noting 

 the heat while the tube was open, to closely cork up the tube below, or in 

 the plane of, the surface of the hotbed ; and, after an hour or two, when 

 the transmission of the entire quantity of caloric, through the body of the 

 dung to the surface, may be supposed to be restored, to again examine the 

 thermometer, and if (making due allowance for the change of weather in 

 the interval) the temperature of the air in the frame should be found just 

 the same as it was while the tube gave passage to a part of the caloric, 

 I confess it would not at all surprise me. Until the experiment be tried, 

 I shall be incredulous of the effect of the President's method for resisting 

 frost, though I fully expect that the heat, given out at the orifice of the 

 pipe, will be greater than will be given out by any other equal area on 

 the whole surface of the bed : but that will be gained at the expense of 

 the residue. I am. Sir, &c. — Causidicus. Nov. 24. 1828. 



Art. VI. Garden Memorandums made during a Tour in Rut- 

 landshire, Nottinghamshire, Lincolnshire, Yorkshire, Derbyshire, 

 Staffordshire, Worcestershire, S^c, in October, 1826. 



The following notes were made immediately after our return, and we 

 have not thought it necessary to rewrite them, for the sake of introducing 

 the changes which have subsequently taken place at some of the residences 

 mentioned, because we have not had an opportunity of seeing these changes. 

 A few additions are made which are enclosed in brackets [ ]. 



London to Wandsford, October!. — Passed Albany Street behind Mr. 

 Horner's Pantheon, Colosseum, or Colliseum : the fii'st name the most 

 appropriate as that of its prototype in Rome ; the second admissible as 

 expressive of its colossal size; but the third absurd, as having no relation 

 to it whatever. Saw on the lofty boundary wall, blocks and tackle projecting 

 for hoisting up the evergreens of 20 and 30 ft. high, which are now planting 

 in an immense wooden trough, supported on posts upwards of 20 ft. high, 

 along the inside of the wall. The intention is to shut out from the garden 

 of the Pantheon the view of the tops of all the surrounding houses. [ Most 

 of these boxes have been since taken down, and the wall has also been taken 

 down and rebuilt, with a view to another arrangement.] The garden of the 

 Colosseum will be divided into two parts, completely separated ; a Swiss 

 garden, with a cottage and waterfall, and an evergreen valley, including a 

 conservatory ; both will be " works to wonder at." — Paltry gateway into 

 the Regent's Park, a little farther on. The steep banks of the road leading 

 to the Highgate archway, now in a state of waste, might be made interesting 

 and ornamental as terrace gardens to small villas. Good effect of the his- 

 torical figure of Whittington, placed in the centre of the flower-garden of 



