[ 6 *3 1 
C P. S. It is now feveral years iince I fird obferv’d 
the very confiderable expanfion of the femi- 
metallic fubdance call’d zink , fpelter , or toot- 
anag j and propos’d it as more fit for the pur- 
pofe of making compound pendulums, and me- 
talline thermometers, than brafs ; as its expan- 
fion feem’d confiderablv greater, and its conflu- 
ence, when gently hammer’d, not much inferior. 
With the fame view I have made trial of feveral 
other metallic compofitions,befides what is above 
fet down ; but they all prov’d much inferior to 
zink in expanfion, and mod of them in con- 
fidence. 
It feems, that metals obferve a quite different pro- 
portion of expanfion in a fluid, to what they do 
in a folid date : For regulus of antimony feem’d 
to fhrink in fixing, after being melted, confider- 
ably more than zink. 
LXXX. A Remark concerning the Sex of 
Holly . By Mr. John Marty n, F. R. S. 
Profeffor of Botany in the Univerfty of 
Cambridge. 
Read May 30, f | A H E holly, agrifolium, or aquifo - 
,?54 ‘ Hum, is defcrib’d, by all the au- 
thors that have come to my knowlege, as bearing 
hermaphrodite flowers : But if an obfervation, which 
I have lately made, is right, this tree is male and fe- 
male in different plants. I have, in my garden at 
Streatham 
