283 jew Publications: 
dipped into the water near it. If a bit. of the: leaf-ftalk of: 
the latter be thrown into the water, it moves itfelf for fome 
time in all directions, while an oily matter iffues fometimes 
from one end and fometimes from the other; which, with-’ 
out doubt, is the caufe of its movement. A like motion is’ 
obferved in other plants which emit a milky juice: the 
Schinus molle exhibits this phenomenon ftrongeft next to 
the Rbus.—Experiments on obtaining fugar from grapes. 
Propofals for preferving lemons from froft. A Differtation 
by Dr. Palloni on the influence of plants to improve the 
atmofphere: Collections by the fame author, to prove the 
variation of climate in the fouthern part of Europe. In- 
ftances of the great age of vines: one is mentioned of 112 
years, and feyeral of two hundred. Gum elaftic diffolved in 
rock oil or naptha produces an excellent varnifh for leather 
wine-bags, and other things; but it docs’not readily dry. 
Experiments on raifing rhubarb in Tufcany. 
Fon dem Perkinifmus, oder den Metallnadeln des Dr, 
Perxins in Nordamerika, nebft Amerikanifchen Zeug- 
niffen, und Verfuchen Kopenbagener, &c.—On Perkinifm,. 
or the Metallic Traétors of Dr. PERKins of North 
America, with American Teftimonies, and Experiments 
of the Phyficians at Copenhagen. Publifhed by M, 
Heruotpr Surgeon, and Affeflor Karn. Tranflated 
from the Danifh; with the Obfervations ef Dr. J. C, 
Tone, Profeffor and Phyfician to the Court. Copenha- 
gen, 1798. 8vo. 108 pages, 
_Profeflor Schumacher at Copenhagen made experiments 
with tractors of bra{s and iron en ten patients in. Frederick’s 
hofpital at Copenhagen. He tried alfo traGtors of ebony and. 
ivory, which are faid to have cured a pain in the knee 3 
with others of filver and zinc ; and fome of copper, and lead. 
By the two laft, pains in the knee, arm, and face are faid»to 
have been mitigated, According to. M. Klingberg’s expe 
~timents, this remedy was of ufe in malum ifchiaticum ; and 
uate } according 
