842 PROFESSOR CHRYSTAL AND MR E. MACLAGAN-WEDDERBURN 
iD | x(¢)_| Diff. for -01, 
3550 | — 57233 30446 
3°565 | — 12564 29974 
3°575 | + 17410 
T, = 3°5692' = 3°569’, say. 
Cg = 24°711 ; c', = 3'8294. 
Corrected for map error, T, = 3°587. 
§ 25. Preriops sy Du Boys’ Rutz. 
The distances from the southern end of the lake are denoted by 2, the unit being 
2x 1760/2°54 feet. The depth, h, is entered in feet. 
| /1/mean /h 1/ mean /h 
2 h Jh | Mean /h da x h wie | Mean ful da 
ie JSh 
0  dx=1 throughout / 20 | 4388 |) 20°93 20°89 “0479 
1 8 9°22 4°61 2169 21) 433] 20°61 20°87 0479 
2}. 165} 12°85 11-03 0907 22} 408! 20:20 20°50 0488 
34 240 | 15°49 Le 0006 23; 406 | 20°15 20°17 0496 
£ | 208 |" 116706 15°77 0634 24) 404] 20°10 20°13 0497 
5 | 272) 16°49 16:27 0615 25 | 402 | 20:05 20°17 0496 
Cf e202 alte L709 1679 “0596 26) |) S329 S987 20°01 ‘0500 
Ci S05 W7-6il 17°35 ‘0576 2) 8500) LSet 18°80 ‘0532 
8 | 322/ 17°94 | 17-77 0563 28:4) “ol Lee li-64 18°17 0550 
9} 333°) 8-25 18:09 | -0553 299\ 7 20s n0G 17°35 0576 
10 | 362 | 19-03 18°64 0536 30 | 280] 16°73 16°89 0592 
ET erolo sa O82, ions 0515 St) 2865 e slG ou 16°82 0595 
Pah 43: | 520-32 20:07 ‘0498 Be 202m alg Og 17°00 0588 
13| 429 | 20-71 20°52 ‘0487 33 | 260] 1612 16°56 0604 
14 434 | 20°83 20°77 0481 34 213) 14°59 15°35 0651 
15 | 436 | 20-88 20°85 0480 35 | 228 | 15°10 14°85 0673 
16) 431 20°76 20°82 0480 36; 210) 1449 14°79 0676 
17 | 426 | 20°64 20°70 0483 37 153 12°37 13°43 ‘0745 
18 | 428 | 20°69 20°66 0484 38 129 11°36 11°86 0843 
19 | 435 | 20°86 20°77 0481 39 0 0 | 5°68 ‘1761 
— = 
_ 2x 1760 x 2°5065 
Hence aqua ———, 
2-54 x /39°2 
=6120"= 10207 
Therefore ri DLO" 
