Mownpay, ApriL 247TH, 1854. 
THOMAS ROMNEY ROBINSON, D.D., PReEsipenrv, 
in the Chair. 
Rev. Samvet Haveuton gave an account of the laws of the 
diurnal tide at Donaghadee, county Down, and at Bunowen, 
county of Galway, as ascertained from the observations made 
under the superintendence of the Committee of Science in 1851. 
Dr. Allman read an extract ofa letter from Dr. W. H. 
Harvey, communicating some anomalous facts respecting the 
tides at King George’s Sound, Australia. 
The Secretary read a letter from Dr. Edward Hincks, in 
which he states:—‘‘ In my communication, printed in the Pro- 
ceedings of March 16, 1853, I mentioned three subdivisions of 
the manah. I have lately discovered a still smaller one, equiva- 
lent to about 4*3 grains. It was the thirtieth part of the shekel, 
or 1-1800th of the manah. The monogram which represented 
it was DUR , and I propose to call it a gerah. The Assyrian 
name of none of these subdivisions of the manah has yet been 
discovered. It seems to me probable that the Assyrians kept 
their accounts in manahs, and in what I call shekels and gerahs 
—the sixtieth and eighteen hundredth parts of the manah. I 
infer this from a sort of memorandum which I met with on a 
terra cotta tablet in the British Museum. It is to this effeet— 
I'Giecel, |e 6) a ae ee Ge 
10 shekels, © 3 . «0.  % ips Reems 
Rn, wk sp! dw COE 
It is evident, from the remainder of the lines being identical, 
that the same ratio exists between the two weights in each 
line; and this appears, from the second line, to be the ratio of 
five to one. It follows that the weights in the second line are 
ten times those in the first; and those in the third are six 
times those in the second. This requires that the manah should 
be equal to sixty shekels, and the shekel to thirty gerahs.” 
