Bae poe aay ie a 
J.D, Whitney on Pectoliie. 205 
At 1500 fathoms the corrections are respectively five and a 
half and seven degrees. 
Nearly all the temperatures observed in the Gulf Stream have 
been taken at depths less than six hundred fathoms. 
Table showing differences of readings of Saxton’s Thermomeler under 
pressure and free from pressure. 
THerMomMeTEeR No. 5. } TuHEeRMoMETER No. 10. 
No. of | Pressure in Pounds. Na of Pressure in Pounds. 
Series 1500, 2000,) 2500. | 3000 3500. 4000.|| Serie". 17500, 2000.| 2500. 3000. | 3500.) 4000 
os re a) ° ° Onda feo ° ° ° 
1 16 0-. | 3°75/0 0 0° 1 O° |2°0 |3°25)4°5 | 625) 8:25 
2 10 1-00 2 1298 [45 [55 2 35 145 |60 | 7-25 
8 10° 10 2°25 | 3°75 | 4°75 | 5:7 3 0°75 2°0 30 | 3°25) 565 | 65 
4 0° (06 050 | 2 36 155 4 175, 01}85 (475) 55 | 7°25 
; x ae 225/35 [50 | 65 ‘75, 1°75) 1°75 | 8°75 | 50 | 675 
r | 125) 225 | 3°75 160 | 65 “00|1°75'3-0 | 425156 | 7-25 
" 08 35 14-96 Means! 1°V0| 1°75) 3:0 
Means! 0-3 1°] 21 13% 145 | 56 
Arr. XIX.—On the Chemical Composition of Pectolite; by 
J. D. WHITNEY. 
; ny FEW years since I made some examination of specimens of 
ia 
which proved on analysis to be pectolite. “A mineral, closely re- 
regs pectolite, from Bergen Hi 
L.C.B 
cal with the stellite of Thomson, was examined at the same time 
and found 
lously suggested by J..D.Dana. Both the stellite and Wol- 
ery Messrs. Heddle and Greg, in a paper on the composi- 
eral. 
by ytwvithstanding so many analyses of pectolite have been made 
-Y different chemists, there has not been a sufficient accordance 
In the res ] ? *,* pia , 
that of Von Kobell has 
me eeerally adopted. It will be sufficient to refer to the va- 
mus peolshed analyses, to see that there is but an unsatisfac- 
ree of uniformity in their results, whether of specimens 
a €rican or European localities. Thus, for instance, in - 
|, Woumnal of Boston Nat, Histor i, 40 
‘ Philos Mag., [4], ix, 238; af  Ectenis sat Marchand’s Journal, Ixvi, 144. 
