May.~] HOT-HOUSE- OF REPOTTING, &C. 179 



Avoid putting plants under trees ; comparatively few thrive 

 in such situations. 



When they are thus exposed to the open air, it will be 

 very little trouble to give them a gentle syringing every 

 evening when there is no rain, and continue your usual 

 examinations for insects : when they appear, resort to the 

 prescribed remedies. Green-fly will not affect them, but 

 the thrips may. Give regular supplies of water every 

 evening, and again in the morning to all that require it, 

 carefully examining those that are in small pots. 



SUCCULENTS, OR THE CACT^EA TRIBE. 



The Cereus Mammallaria, and Opuntia. Divisions of 

 this family are, in their indigenous state, exposed on rocks, 

 hilly lands, and arid situations, being at all times fully ex- 

 posed to the sun : still, with us, we find that they thrive 

 best with a partial shade, though we have frequently seen 

 them doing well when fully exposed to the influence of the 

 sun ; but where they are to be kept out of doors all the 

 season, be careful in choosing for them an airy situation, 

 and never allow the pots to become saturated with moisture. 



The habits of the Epiphyllum tribe are entirely differ- 

 ent ; they are generally parasites, growing on the branches 

 and about the roots of decayed trees ; consequently, they 

 are often much shaded, and they evidently show it, for they 

 still delight to be shaded from the direct rays of a noon-day 

 sun. If they are kept in the house through the summer 

 months, take some whiting, and make a thin white- wash, 

 and put it on the inside of the glass, which will be found 

 an agreeable and effectual shade ; but where time and 

 means are at hand, a thin awning, of gauze or muslin, is 

 preferable, provided it is regularly rolled up when the sun 

 is not powerful. 



