60 LANDS OF THE ARID REGION OF THE UNITED STATES. 
was found in making the second that the shifting gravel of the beach had 
buried the column so deeply as to conceal half the graduation. 
Dr. Park has kindly furnished me a copy of Mr. Mitchell’s record. 
The observer was instructed to choose such times of observation that the 
influence of wind storms upon the level of the lake would be eliminated, 
and the work appears to have been faithfully performed. 
Record of the height of Great Salt Lake above the zero of the granite pillar at Black Rock. 
Date. | Reading. Wind. | Date. Reading. Wind. 
HP al ae aia ; = 
a pI 5 | nD Be] s 
Year. | Month. | 3 eS 3 8 Year. Month. | # & 3 8 
| eet ce mae as 2.) ScleewlGe aes 
1875.------ September..|14, 0] 6 | N. | Gentle. | 1876......... Revvilccesd (abel) WN A Wee Calm 
22 | 0 5k | N. E.| Quiet. 25 1 3 |N.E.| Quiet. | 
= 23| Oo} 5 |N.E.| Quiet. | May ...-.--. 2 1] 4 |N.E.| Quiet 
October..-.- 6 0 44) N. | Quiet. 22 1 N. | Quiet 
| | o| 4 |N.E.| Quiet. dune ee. see 2| 1] 1 | W. | Quiet 
18 0] 3% /N.E.| Quiet. || 8 WO WNesesos Calm. 
| 26 0 3 | N. E.| Quiet. 13 2| .2 |N.E.} Quiet. 
November ..| 9 > 0 2 W. | Quiet. 23 2 4 |N.E.} Quiet. 
16} Oo} 1! N. | Quiet. || 30 2} 6 | S. | Quiet. 
23| o| 4 |N.E.| Quiet. Tulyaes.s2e 18 2| 3 |N.E.| Quiet. 
29 0 54 | E. Quiet. 25 2 4 |N.E.| Quiet. 
December ..| 7 | 0 5 | E. | Quiet. || August .--. 2 3 |N.E.} Quiet. 
| 14 | | 5t| E. | Quiet. || 10 2| 2 |N.E.} Quiet. 
21 0 6 |N.E.| Quiet. | 22 1 9 |N.E.| Quiet. 
1g 76 see | January...) 5| 0] 8 |N-E.| Quiet. | 29/ 1] 8 |S.E.| Strong. 
11 0| 8 |N.E.| Quiet. 30 1| 8 | N. | Quiet. 
| loe9| o| 9 | = | Qniet. | September: |i14i aia |i aren eee Calm. 
| February...| 1) 0] 9 |S.E.| Quiet. | : 19 1| Gt] N. | Quiet. 
| 5} 0) Oop Pepe Calm. | 26 a VG: | eocees Calm. 
| 22 0 93 | N.E.| Quiet. || October. -.-- 9 1 54 | N. E.| Quiet 
| Mareh ...... 15 0| 11 |N.E.| Quiet. HILO 77 eee iy seas 12 2 (Ye hoes Calm. 
| 22| 1] oO |N.E.| Quiet. | October. .... TE) OP AO. aces Calm 
| 28) 1 4|N.E.| Quiet. || 
| 
| 
| 
| 
} 
Comparing the October observations for three years, it appears that the 
lake rose 13 inches from 1875 to 1876, and fell in the next year 64 inches. 
The Black Rock pillar has not the permanence that is desirable. 
Although it has thus far been only the more firmly established by the 
action of the waves, it is still true that the lake is encroaching on the land 
in this part of the coast, and a storm may at any time undermine and 
overthrow the pillar. To provide for such a contingency it was deter- 
mined to establish a bench mark out of reach of the waves, and connect 
it with the pillar by leveling, so that if the existing standard should be 
