Prize Quefihn. 42 C 



and the moft important of them are as follows: I. If a 

 plant .is fuffered to imbibe a coloured fluid, it afcends in the 

 veffels between the pith and the bark, penetrates to the 

 leaves, and then proceeds through the bark a certain fpace 

 downwards. 2. When a plant or a twig is comprefled at 

 the bottom by a ligature, a fuelling takes place upwards 

 towards the" ligature. 3. When the bark of a tree is taken 

 off, without injuring the interior part, the upper edge of the 

 wound produces a greater quantity of moifture than the 

 under. 4. Under thel'e circumftances an excrefcence is 

 formed on the upper part of the bark, and not on the 

 under; and the renovation of the inner bark, which has 

 been loft, takes place from the top downwards. 



II. What beneficial ufe may practical medicine derive " 



from Humboldt's well known experiments on Galvanifm and / 



metallic irritation ? 



The Academy expects that the difeafes and cafes, in 

 which Galvanifm may be ufeful, will be accurately deten- 

 mined by proper experiments ; and that the experirW^tts - 

 will be clearly and fully defcribed. Experiments, JK5weve.r, & 

 on perfons apparently dead, are to be omitted. ■'■ sj& 



The Academy requeiis all anfwers to thefe queftionsy if 

 founded on experiments actually made l£ the authors, to be 

 legibly written in Latin: to be iufenbed with any motto 

 according to pleafure; and to 3e, accompanied with a fealed 

 note, having on it the fame motto, -and containing in the 

 iniide, the name, title and place of .-residence of the author; 

 and to be transmitted, before the firft of Oclobcr 1799, to 

 the prefu<ent,of .the^iV^iciemy, G. II. R. von Schreber at 

 I2rl:mgen. ^ Sy 



The pnje,;Jcr .each queftion, is a gold medal ..of twenty 

 ducats yalue, bearing the ufual impreilion, and will be ad- 

 judged to the author of the bell papers, by the commiffionerq 

 gf the Academy, on the 5th of January 1800. 



MAGNETISM, 



