ies 
moses 
ie ae 
: a. oe ak we a 
= ge 3 © ie": # : Se" a 
= 
n at Tilia — 
a+} Se ee ee “am | ju 
pact, ai ering, acs a small quantity of fresh deid, a 
noi ion, at the rate of seventy five vibrations in a minute, has 
< acid, the motion might be arama for an indefinite length of 
time. 
The motion, here described, is cial distinct from that produced 
by Hie electro-magnetic combination. of wires and magnets 3 3 it results 
dire 
the mechanical action of ordinary magnetism: galvan- 
ism being only introduced for the purpose of changing the poles. 
_ My feted, Prof. Green; of Philadelphia, to whom I first exhibited 
is machine in motion, recommended the substitution of galvanic 
magnets for the two perpendicular steel ones. If an article of this’ 
kind was to be constructed on a large scale, this would. undoubtedly 
be the better plan, as magnets of that kind can be made of any re- 
‘quired power, but for a small apparatus, intended merely to exhibit 
the motion, the plan here described is perhaps the most convenient. 
* 
= 
Arr. XVIII. — Drestription and History of a new Plant, Tillia Pye- 
nanthemoides 3 by Meuines Conxurs Leavenworrs, M. D. 
of prea, Ga. (With a drawing.) , 
Waterbury, Ct. May 17th, 1881. 
Dear Sir,—I transmit to tng a description and. drawing of an 
American plant, which hitherto appears to have evaded the rosereeliat 
of botanists. The generic name which I have bestowed upon itis com- 
memorative, and in compliment to my friend, William Tully, M. D. 
Professor of Botany, Materia Medica, and ‘Therapeutics, 1 in Yale 
College, I believe, (with a single exception,) the earliest culty 
of scientific botany, under the Tinea meth int the state 
necticut. - Sir, very ee ete. 
. C. Leavenwortu. 
DESCRIPTIO UBERIOR. 
Caulis bi vel tripedalis, quadrangularis, subpubescens, supra me- 
dium ramosus; rami numerosi, axillares, subfastigiati, incano-to- 
mentosi, 
