568 Notices of Communications to the Society, of which 



The foundation wall in front of the house is capped with a 

 stone sill H ; the front upright lights F move on centre pins, 

 and can be taken out from their places without disturbing 

 the rafter plate B, or the uprights which support the plate ; 

 these lights, when taken out, can be fixed by the lower ends 

 to the inner side of the stone sill, the spaces of the upright 

 being filled by other pieces whilst the tops are held by a 

 board D longitudinally fixed to the rafter by hinges C, and 

 capable of being raised and let down at pleasure. When the 

 Vines are to be exposed they are unfixed from their places 

 between the rafters and laid down on the stone sill ; the 

 front upright lights F are then taken out and fixed on the 

 inner side of the sill E, thus leaving the whole of the Vine on 

 the outside of the house, and under cover, protected from 

 rain, until it is desired to put it again into heat, when the 

 situation of the upright lights is changed, and they are re- 

 placed in their former situation. A is the rafter of the house, 

 and G the position of the Vine in summer. 



April 2, 1821. Mr. Joseph Busch, gardener to His 

 Majesty the Emperor of Russia, at St. Petersburgh, in a 

 Letter to the Secretary, received this day, communicated the 

 following notes on Horticultural subjects. 



" Hydrangea hortensis will be turned blue by watering the 

 young plant, the summer before, with allum water.. Our 

 gray coloured earth, under the blackamoor earth, will have 

 the same effect, being combined with aluminous salt. 



" Sprinkling Gooseberry and Currant bushes with tar water 

 prevents the fly settling on the plant to lay its eggs ; this 

 must be done early in the spring, for if done after the fruit is 

 set, it will taste of tar. 



