Transactions of the Prussian Gardening Society. 443 



already familiar ; it abounds, however, in local notices of 

 productions, new or remarkable, raised in different parts of 

 Prussia and other German states ; which show the very gene- 

 ral taste for gardening and plants in that part of the Conti- 

 nent, and the rapid progress making in their culture. 



1, Notices of vohat passed at the Meeting of Jan. 7. 1827. 

 M. Hartweg, inspector of the grand-ducal gardens at 

 Carlsruhe, sent a packet of celeriac [turnip-rooted celery] 

 seeds, with some remarks on their culture. Less care is re- 

 quired in bringing celeriac to perfection than is generally 

 believed : the soil should be light, rich, and sandy, rather 

 than loamy. The seed should not be sown so early as that 

 of the common celery, otherwise the root-stock grows too 

 large, and becomes hollow. The time for sowing it at Carls- 

 ruhe is the beginning of March ; and, for transplanting, the 

 beginning of May. Water must be supplied liberally during 

 the whole season ; and about the end of summer the roots 

 will be found from 18 in. to 22 in. in circumference* 



2. On the Effects of Frosts on Fruit Trees during the Winters of 



1823 and 1826. 



3. Extracts and Translations from the London Horticultural 



Transactions. 



Upwards of fifty pages, chiefly on the culture of the straw- 

 berry and the pine-apple. 



4. Notices of what took place at the Meeting of Feb. 4. 1827* 

 Professor Link made known to the Society a communi- 

 cation which he had received on the growth of the truffle 

 (Tuber cibarium Sibth.) in West Prussia. The truffle is found 

 in all the islands of the Vistula on which oaks or elms grow* 

 The soil in which the truffle abounds consists of the mud 

 which remains after the overflowing of the river. This mudj 

 however, often contains sand ; and in that case the truffles 

 are smaller, and not so plentiful. Moisture is essential to 

 their growth, as proved by their abounding on those islands 

 which are often inundated ; while on others, which the water 

 does not reach, they do not grow. In dry weather, they are 

 found almost on the surface of the ground ; but their usual 

 position varies in depth from 3 in. to 12 in., in proportion to 

 the moisture. Pigs are employed to discover truffles ; and 

 they may certainly be expected in the same place where they 

 grew the preceding year. Under favourable circumstances, 

 they will be fit for use in August ; but, for exportation, they 

 should be gathered in October and November, which is their 

 proper period of perfection ; although, in good weather, their 



