Scientific Intelligence, 
There is consequently an oxygen ratio of NH,O:SO,:HO=8 
26°94 : 17-28, which is almost exactly as 1:3:2 from which we h 
the general formula RO, SO,+-2HO. Pein 
[It may be interesting to mention that there is an artificial salt with 
ea formula, exactly corresponding to this RO, SU, + 2HO, and 
same for i f 
. 119, (Card. Edit.,) Séguin, Ann. Chem. 91, 219; Reffault, Ann. 
_ Ghem. et Phys. 20 (432)—(435) describes the salt and its preparation, 
Berzelius (3,286) mentions that. the crystals are derived from right rhom 
__. This mineral was first brought to this country in January last by. Dr 
_ John L. LeConte, on his return from Honduras; he discovered: it in the 
3 iedras, in the vicinity of Comayagua. It occurs in trimetric 
: eave near the entranc at the time of his visit, 
worked for the nitre, which was obtained “directly by lixiviating the 
taken from near the m of the ieee 4 ix contai 
In honor of Dr. LeConte, who has been the means of adding this. 
. ite. 
# Chalk, in the state of dry powder, be * be 056 
Clay eee ae 
Jand “ & Re sae ee a ea 
_ Sand and clay, “ Like gb ni ‘11 
The conductivity of the following rocks is given in two states—dry, 
water :-— Boe 3 
Dae Th Mock 8 ee ade SO 
lite rock, fae ee es ee we pe -30 “40 
ird compact limestones, - -  - + ‘50 ‘35 
us New Red Sandstone, le. ee ee 
eS - x cS ge 4s 
t sandstones (Mi ‘She 
