946 



SCIENCE 



[N. S. Vol. XXV. No. 650 



VALUES OF M'S AND N's, WITH LIMITING DECLINATIONS. 



Decl. at -which Tenn can amount to 0".005 



iVj = — l/2(fa2cosM (tan'M — 1) Bm^ 1" 

 + M' sin^ 1" 



— 3/ida' cos2 <!(?(i2 (tan^ 6 — 1) sin* 1" 



+ 1/24 dat C03' <5 (tan« (5 — 12 tan^ (5 + 5) sin« !■" 

 + 2/3 d(5* sin* 1^' 



JV^ = da^ cos2 (5 tan (5 sin' 1'' 



+ 1/2 cfa2 cos= (id(5 sec2 (5 sin* V' 



JVj ;= rfa COS (5 sin' 1" 



+ 3/2 (ia cos d dS tan eS sin' 1" 



+ 15/8 da cos S d6' sin* 1'' 



— 1/6 da^ cos' (J (7 tan^ cJ — 5) sin* 1" 



iV8 = rf(isin2 1" 



— 1/2 da' cos2(5 tan (! sin' 1" 



— 3/4(ia2cos2(5d(} (tan2(5 — 1) sin* 1'' 

 + 4/3(^(5' sin* 1" 



JV, = l/8 (i(S2 (3 tan* (5 — 2 tan' (5 — 1) sin* F' 

 + d(j2 cos' (5 sin* 1" 



JV, = 2da cos (5 d(5 sin' 1" 



JVr, = (i(!JsiB«l'' 



We find them to be : 



Right ascension, A, = 

 Declination, D, = 74° 



: 3° 51' 2«".08, 

 58' 2".52. 



From A, D, a,, 82, we now compute x^, y^, 

 also by our former series. These come out: 



: + 1733".92, 



l/j = — 90".28. 



If we now apply equations (1) of the pres- 

 ent paper to the data a^, Sj, a^, 8j, x^, y^, we 

 should arrive at the same values of x^, y,. 

 Actual calculation of the expressions appended 

 below gives : 



with the values obtained in the previous cal- 

 culation vsdth the old series. 



Harold Jacoby 

 Columbia Univeesitt 



These numbers are in satisfactory accord 



CURRENT NOTES ON LAND FORMS 



UPWAEPED MOUNTAINS IN ALASKA 



The descriptions of certain ranges given by 

 A. H. Brooks in ' The Geography and Greology 

 of Alaska ' (prof, paper no. 45, U. S. Geol. 

 Survey, 1906) furnish additional examples of 

 upwarped plateaus, carved into mountainous 

 form by normal and glacial erosion, as already 

 indicated in Gilbert's volume on ' Glaciers ' in 

 the reports of the Harriman Alaskan Expedi- 

 tion. The coast range, or southeastern part 

 of the Pacific mountain system in Alaska, is 

 said to be an irregular aggregate of mountain 

 masses with little symmetry of arrangement 

 ex(3ept a rough alignment along a north- 

 west-southeast axis. The whole aspect of the 

 range is rugged and precipitous, from the 

 needle peaks and knife-edge crests down to 

 the sharply incised channels. This young 



