REMARKS ON GROWING FJ.ANTS IN GLASS CARES. 153 



the majority of the pinks cultivated in the neighbourhood of the me- 

 tropolis were very defective in their lacing. 



Florista. 

 A Midland County, 12th June, 1844. 



ARTICLE VI. 



REMARKS ON GROWING PLANTS IN GLASS CASES, 



BY CALEDON1CUS. 



{Continued from page 137.) 



The degree of humidity which is thus maintained is not, however, 

 suited to all plants. Those which partake largely of a cellular struc- 

 ture, and possess a succulent character, and especially those which 

 have fleshy leaves, hear best the atmosphere generally existing in 

 these cases ; whilst, on the contrary, its continued humidity is un- 

 favourable, says Mr. Ward, to the development of the flowers of 

 most exogenous plants, except such as naturally grow in moist and 

 shady situations. If, indeed, we call to mind the vast quantity of 

 moisture which many plants naturally exhale in the free atmosphere, 

 and the check which their vegetation receives if the atmosphere con- 

 tinue for some time both humid and still, we cannot wonder that to 

 such plants the moist, air of these cases should be unsuited, and that 

 many of them, placed in such circumstances, should, as it is said, 

 " damp off." But others of a different character, whether growing 

 in the soil, or suspended from the roof, find always sufficient mois- 

 ture to support a healthy vegetation. Hence the supply of water 

 given to the soil in the first instance, being secured from waste, is 

 successively absorbed, exhaled, and condensed within the. case itself, 

 and made to sustain over and over again the vegetation of the same 

 plants, without suffering either the soil or the atmosphere to become, 

 at any time, too dry to carry on that process. 



Condition of Plants, in regard to Heat, in close Cases and in the 



free Atmosphere. 

 The condition next to be noticed is that which relates to tempera- 

 ture. In the list of plants growing together in these cases are some 

 which are natives of the tropics, others which have been brought 

 from high latitudes, and others the growth of our own temperate 

 clime. Now the varying effect^ of climate are well known so far to 



