598 Transactions of the Prussian Gardening Society. 



only. The progress and result of this experiment is minutely 

 shown in a table, and here it is only necessary to mention that 

 twenty plants from old seeds produced eight fruit more than 

 twenty from fresh seeds, and that the fruit of those plants 

 which had not been transplanted weighed, on an average, 

 2 lbs. 2 oz. ; while those from plants which were transplanted 

 weighed 2 lbs. 8 oz. on an average. Finally, M. Toussaint 

 wishes that such experiments may be carried on by others, 

 and a garden appropriated to this purpose, to ascertain the 

 best and most durable soil and manure for those plants. 

 [Mr. Figgans's communication, p. 567., on the results of 

 growing the cucumber and the melon in heath mould, is 

 congenial with the above experiments.] 



The result of this experiment, respecting the flavour, was, 

 that the best-flavoured fruit were produced in the mixture of 

 two thirds leaf mould and one third horse-dung ; the fruits 

 produced in the other mixtures were less delicate, although 

 supei'ior in flavour to others produced in the common garden 

 soil. The least-flavoured, which were sweet, but mealy, were 

 those produced in the mixture of two thirds cow-dung and 

 one third turf. 



49. Report upon the Experiments on the Impregnation of Plants. 

 By Professor Henschel, at the University of Breslau. 



M. Henschel gives a detail of his observations on na- 

 tural impregnation, and on the effect produced on the seed 

 or fruit, when parts of the organs of plants are hindered from 

 performing their functions. Secondly, he treats on artificial 

 impregnation, and its results ; thirdly, on the impregnation 

 with pollen of other plants, not belonging to the same genus, 

 &c. &c ; fourthly, he details experiments with what he calls 

 *' modified impregnation," or with pollen of the same, or from 

 other plants, mixed with a substance of a different nature ; 

 fifthly, he treats on impregnation with foreign substances, as 

 carbon, &c. &c. These experiments are minutely described, 

 and a view of their residts given in tables. 



51. Meeting of the Society, Nov. 2. 1828. 



M. Langmatz gave an account of the advantage of worm- 

 wood for producing potash. On a place of about a square 

 rod he obtained 108 lbs. of herbage, which after it was burnt 

 gave 11 lbs. of ashes, and from this he extracted 5^ lbs. of 

 rough potash; while from 100 lbs. of birchwood he only 

 procured 4^ lbs. of ashes, and 1 000 lbs. of this ashes only 

 make 219 lbs. of potash. This experiment shows how advan- 



