THE ROSE AND ITS CULTURE. 



261 



quantity (be the other ingredients ever so abundant) 

 means the production of a small plant. 



Turnips F and g illustrate the effects of sohcble and 

 insoltible phosphate of lime. The sand and water used 

 were similar to those for the other experiments. 

 Mineral plant-food was given to each, but to f the 

 phosphate of lime was employed in an insoluble con- 

 dition, and to G in a soluble state. The results 

 obtained indicate that Turnips may take up phos- 

 phoric acid in a variety of forms, but that every 

 kind is not equally beneficial to robust plant- growth. 



The value of these illustrations is much enhanced 

 by the fact that they were not made on a single 

 plant, which might by accident give a misleading 



Potassium 

 omitted. 



Potassium 

 omitted. 



result, but that there was a duplicate of each, and 

 that these duplicates confirm each other. 



The diagram in Fig. 10 is also interesting as show- 

 ing the comparative growth of Turnips, u-ith and 

 without certain chemical ingredients, on the barren, 

 sandy soil at Hassock's Gate, Sussex, where Professor 

 Jamieson for several years has been conducting a 

 series of agricultural experiments. The diagram 

 represents typical plants taken from each plot of 

 fifty Turnips. Allowing for the fact that these 

 latter experiments were conducted in a natural or 

 unpurified soil, though a sandy one, it will be seen 

 that the results agree closely with those shown in 

 the preceding diagram. 



The practical inferences to be drawn from these 

 facts regarding the value of certain constituents in 

 mamires are of the highest importance. It is obvious 

 that a plant can only grow vigorously, thrive, and 

 attain to full maturity when all the essentials of 

 plant-life are present in the soil, and in a sufficiently 

 available form. 



THE ROSE AND ITS CULTURE. 



By D. T. Fish. 



CVLTIVATION OF THE ROSE UNDER GLASS. 



THIS branch of Rose culture, like the cultivation 

 of this beautiful flower in pots, may be said to 

 be yet in its infancy, and it is to be hoped that in 

 the near future Rose-houses and Roses in pots will be 

 as plentiful as conservatories, plant-stoves, Orchid- 

 houses, and Fuchsias, Pelargoniums, Begonias, Ca- 

 mellias, Heaths, &c. 



Any glass-house, with a tolerably good clear roof, 

 will grow Roses, and produce them in abundance, 

 without artificial heat. But to have Roses all the 



lorus 

 ;id. 



year round will require a sufficiency of artificial 

 warmth to insure a temperature of at least 60° in all 

 weathers, that is, 2S° of artificial heat when the exter- 

 nal thermometer is at the freezing point, or double 

 that amormt when the thermometer is at zero, or 0". 

 Prominence is given to this fact at starting, to prevent 

 disappointment, as it is often authoritatively stated 

 that no artificial heat is required to grow Roses 

 imder glass. Of course not. Plants that live and 

 thrive in our climate without protection, may be as- 

 sumed to live in greater safety under the shelter of 

 the additional six or eight degrees that a mere glass- 

 house affords them. But cool glass-houses, while 

 mostly affording a full supply of Roses at certain 

 seasons, cannot be depended on to furnish Roses at 

 ever}/ season throughout the changing year, with 

 a free run of temperature from zero to 90°. The 

 additional tenderness of our finest strains of Roses 

 furnishes another argument, were any more needful, 

 in favour of the erection and warming of glass- 

 houses for Roses, planted out or in pots. 



MagTiesium Nitrogen Everytliiug Sulphur Phosphorus , Calcii 



omitteci. omitted. omitted. omitted. i niitted. omitt 



Magnesium Nothing All Nitrrgen Sulphur Phosph 



omitted. omitted. omitted. omitted. omitted. omitt 



Pig. 10.— TuBNiP Plants grown with and without various Food Elements. 



