34-0 Transactions of the Prussian Gardening Society. 



cult in proportion to the age of the tree, and the extent of 

 the roots. 



6. All transplanting ought to be clone when the trees are 

 young, and then only can the roots be cut without injury. 



7. When the tap root descends into a bad subsoil, it brings 

 on diseases in the tree. 



The general conclusion which the writer draws is, that 

 where the largest and best timber trees are an object, the 

 seeds should be should be sown where the plants are to remain, 

 and, consequently, the tap root never injured ; but that, in 

 fruit trees, it should always be shortened, to cause them to 

 spread out horizontal roots near the surface, among the nutri- 

 tive soil. 



25. On the Effect of the Frost during the Winter of 1822-3. By 



M. Bosse. 



Peaches and apricots were destroyed by from 15° to 20° 

 below zero of Reaumur (2° to 13° below zero of Fahrenheit). 

 Vines, particularly the oldest plants, were much injured. 

 Cherry trees exuded gum more than usual the next season. 

 Apples and pears were not generally much hurt, though some 

 of the more tender sorts were killed. Walnuts and chest- 

 nuts were less injured than might have been expected; but 

 Robin / a Pseud- Acacia was killed, and even some oaks on the 

 exposed side of the forest were split. The ground was frozen 

 from 3 to 4 ft. deep. 



28. Extract from tvhat passed at the Forty fourth Meeting of the 



Society, "which took place on Sunday, Aug. 6. 1826. 



A disease is often observed in peach trees, which occasions 

 the shrivelling up and dropping off of the leaves in spring. 

 This is supposed to be caused by the sudden changes in the 

 weather checking the sap ; and therefore retarding the vege- 

 tation of the tree is said to be an effectual preventive. The 

 retardation is effected by laying bare part of the roots during 

 the winter. 



29. On Yrunus cerasifera [the Myrohalan Plum'], as a Stock for 



Plums and Peaches. By M. Borchmayer. 



After twenty years' experience, this vigorous-growing stock 

 is confidently recommended. One of its advantages is, that 

 it produces no suckers. It may be propagated either by 

 layers or cuttings. 



31. On the Use of a Mercurial Ointment in preventing the Ascent 

 of Insects up the Stems of Trees. By Dr. Kitaibel. 



A cord is smeared with the ointment, and tied round the 



