3 
* 
ne 
m 
Proceedings of the American Philosophical Society. 31 
,# 
method of placing the needles in pairs, over that which he has hitherto 
employed, of keeping each needle separate from the other. A sugges- 
tion also results in the use of the dipping needle, of the necessity of as- 
certaining that the needles have, in the reversal of the poles, been charged 
nearly, or quite, to saturation. The author takes occasion to correct his 
statement in regard to the inefficacy of heating needles in boiling water 
in producing an approach to a permanent magnetic state. The observa- 
tions at each station, with the corrections employed, are given in tables; 
and the numbers observed for the dip, or calculated for the horizontal or 
total intensities, are compared with the results of other observers. 
he memoir concludes with the following abstract of the numerical 
Its. 
resu. * 
| Long. from Horizontal Total 
No. Places, Latitude. | Paris. Date. intensity. | Dip. intensity. 
: / peer Faria=]|,, , jParese 
Edinburgh, [55 57N| 5 32 W ).841 * 
Dublin, 3 231 8 41 ).879 s 
3}Lon 31 “| 2 26 « ),939t 
4/Brussels, P51) 2 ).969 
Berlin, » 32 « 11 02 « 0.979 
6|Paris, 3 “1 0 00 “ 000 
Vienna, 3 13/14 02 « 090 
8iThe oe BEES ae to 099 
Brientz, Tisec PR Sa es 078 
10/The Faulhorn,|— am 1.082 
eneva, 46 12 “| 3 49 « .086 
Chamberi, ee cee 089 
13/Chamouni Sigg, A 688 
) 46 “ 2 DQ & 078 
lan, 5 28 «1 G51 111 
enice, > 26“ 110 10 1.129 . 
1e: te, 5 38% “ 1.128 ~ 
18)Florence, 347 | 8 55 « 1.170 
urin, 5 04 * 1 5 QO IJ 1.094 
Rome, 54 «110 10 « |May 1 225 
21Naples, 49. 52 « | © IM 1.249 
The committee, consisting of Mr. Nicklin, Prof. Bache, and Dr. Hays, 
to whom was referred a paper, entitled ‘‘ On the Patella Amena of Say, 
by Isaac Lea,” reported in favor of publication, which was ordered ac- 
gly. 
In this paper, Mr. Lea gives a synonymy, showing that the Patella 
ps tof Say was first described by. Miller, under the specific name of 
éstudinalis : Zool. Dan. p. 237; and Mr. Couthouy, having lately given 
a" &laborate description of the animal in the Boston Journal of Nataral 
tence, showing that it belongs to the new genus Patelloida, recently 
established by Quoy and Gaimard ; Mr. Lea argues that it should hence- 
forth be called Patelloida Testudinalis. 3 oP 
"OSS alee 
: Dip not observed. ast 
Mean of results in J une, July and August, 1837, and in July and August, 1838. 
