1883,] 31 [ Williams, 
* 
wie Catalogue , s7 Micrometer |Level Cor-| + .,, 
Date. No. of Stars. 14 (8 + 8"). | Correction, | rection. Latitude, 
. 1888. 
“:'T™0, 6, 495 | 89 68 56.523) + 1 12.567) + 81,815 89-91 
" 550 89 69 66.002 | 4 j 43.19 
Ni 569 40 6 19.803 | — 6 86.99 
2mo. 8, 475 40 10 44.976 | — 10 86.83 
My 475 40 12 12.959) — 11 89.44 
hi 495 | 89 68 55.108) + 1 89.67 
ni 550 89 69 66.806 | + 40.84 
al 569 40 6 20.181) — 5 89.70 
by 591 89 61 85.175} + 9 40.88 
Ny 59L 40 6 10.217|— 4 89.62 
2mo. 9, 475 40 10 44.976} — 9 43.16 
hb 489 = 495 89 68 55.198 | + 1 88.79 
g 507 «B69 40 6 20.1825; — 5 41.88 
ha | Qa 710 89 66 19.1645) + 4 89.20 
bn 607 = 710 89 54 84,2665) + 6 42.46 
2 mo. 12 466 475 40 10 44.041) — 9 41.97 
“\ 189 195 80° 68 65,782 jot 1 85.43 
“i 630-30 89 69 58.5065) + 40.84 
he 567-569 oH ° 8 575) — 5 89.41 
hh 578 ~—s BAL ee — 4 87.78 
ib 697-710 B94 6 45.65 
2 mo. 13 466 75 40 10 10 3. 87,11 
i 5s7 «669 7 6 5 185 87.20 
Re 697 710 89 4 6 AG 42.18 
2mo, 23 530 «650 89 59 Ay 42 88 
Wika Vos) TON 89 56 621. | 4 87,868 | - 1.882 40.01 
2 mo, 27, 530 «= B50) | «© 89) 697,081 | + 44,200 1 4 By 44.88 
8mo. 8, 812 82 89 64 18.609) + 6 2% - 2.047 44.69 
3 mo, 13, 779 |) (81g 40 0 26,399 | + + 11.496 41.27 
oe 779 = B84 89 68 63,.750|/ + 6 8 4 11,025 40.06 
re 776 859 | 809 66 48.715) + 8 47,881 | + 7.718 88.81 
3 mo. 14, 812-822 39 54 19,105! + 6 24.096 43,20 
The mean of these 76 results gives the latitude of the Observatory 
40° 0/ 40,085, 
Assuming them all to be of equal weight, the probable error of a single 
Observation is 1.706 and of the final result .191/’. 
Norm—The value of the longitude of the Observatory, standing on our 
books, but obtained, we do not know how, is 6m, 59.3 sec, East of Washington, 
At the time of the Transit of Venus, Washington time was telegraphed to our 
railroad Station, distant one-half mile from the Observatory and compared with 
Our local time, The mean of three days’ comparisons gave a difference of 
6M. 59.6 sec, 
On a Orinoid with Movable Spines. By Henry 8. Williams. 
(Read before the American Philosophical Society, April 20, 1883.) 
Among the rarer forms of the second fauna of the upper Devonian, at 
the base of the Chemung group, Ithaca, N. Y., is a Crinoid with some 
Interesting features, 
Tn its general characters it agrees with the family Platycrinide of Romer, 
and. fulls under the section Hewacrinites as defined by Wachsmuth and 
Springer in Revision of the Paleocrinoidea, Pt. II, p. 56. 
PROG. AMER. PHILOS. soc. XxI. 114. K. PRINTED JUNE 22, 1883. 
