July 19, 1907] 



SCIENCE 



93 



unique in its way as are the zigzag ridges of 

 the Pennsylvania Alleg-henies. Its develop- 

 ment, on the more-than-one-cycle scheme, ap- 

 pears to have been as follows: The great body 

 of complicated crystalline rocks was eiiectively 

 baseleveled in ancient times, and covered un- 

 conformably with early paleozoic strata. The 

 compound mass was afterwards broken by 

 numerous faults, which divided it into many 

 irregular, (nearly) vertical prisms; and the 

 prisms were irregularly jostled and tilted. At 

 that time the surface must have been charac- 

 terized by many displaced blocks, topped with 

 paleozoic strata and separated by fault scarps. 

 Then the whole district was again baseleveled; 

 this being indicated by the general accordance 

 of upland heights to-day, irrespective of faults. 

 On the peneplain thus produced, the paleozoic 

 strata would remain only where they lay below 

 baselevel. A broad upwarping introduced a 

 new cycle, which has now advanced (glacial 

 erosion included) so far as to have almost 

 entirely consumed the previously inaccessible 

 remnant-covers of paleozoic strata, thus devel- 

 oping fault-line scarps in good number; while 

 the fault lines through the crystalline uplands 

 are now marked by narrow fault-line valleys. 

 This case is similar in some respects 

 to that of the Hurricane ledge in Ari- 

 zona, next north of the Colorado canyon. 

 When first described by Button (Monogr. 

 II., U. S. Geol. Surv.), this strong escarp- 

 ment was interpreted as marking a recent 

 fault, and its height was taken as a meas- 

 ure of the fault. Reasons have since been 

 given for believing that the fault is not recent 

 (where the IST-S fault line crosses certain ero- 

 sional E-W escarpments, the corresponding 

 members of the latter are out of line by sev- 

 eral miles, and this departure from aligimient 

 must represent the excess of escarpment re- 

 treat in the heaved block over that in the 

 thrown block) ; that the original displacement 

 was essentially obliterated by baseleveling (a 

 level, unbroken lava flow crosses the fault line 

 at one point, passing evenly from strong to 

 weak rocks) ; and that the existing scarp is a 

 fault-line scarp produced by the action of re- 



vived erosion on the weaker strata along one 

 side of the fault line. W. M. D. 



STAFF OF TEE ROCKEFELLER INSTITUTE 



The Eockefeller Institute for Medical Re- 

 search has adopted as titles for its staff mem- 

 ber, associate member, associate, assistant, 

 fellow and scholar of the Rockefeller Institute, 

 and has made the following list of appoint- 

 ments : 



Member of the Institute and Director of the 

 Laboratories — Simon Flexner, pathology. 



Member of the Institute — S. J. Meltzer, 

 physiology and pharmacology; E. L. Opie, 

 pathology; P. A. Levene, biological chemistry. 



Assistants of the Institute— Kidejo No- 

 guchi, pathology; John Auer, physiology; 

 Alexis Carrel, experimental surgery; J. W. 

 Jobling, pathology; Nellie E. Goldthwaite, 

 chemistry. 



Fellows of the Institute. — C. M. A. Stine, 

 biological chemistry; Donald Van Slyke, bio- 

 logical chemistry; Martha Wollstein, pathol- 

 ogy; Maud L. Menten, pathology; Mabel P. 

 Fitzgerald, bacteriology; Don R. Joseph, 

 physiology; Benjamin T. Terry, protozoology; 

 Thomas W. Clarke, pathology. 



Scholar of the Institute — Bertha I. Barker, 

 pathology. 



Grants to aid special researches have been 

 made to the following : Robert M. Brown, New 

 York; C. H. Bunting, Charlottesville, Va. ; 

 Katherine CoUins, New York; Cyrus W. 

 Field, New York; N. B. Foster, New York; 

 Joel Goldthwaite, Boston; Holmes C. Jack- 

 son, Albany; Arthur I. Kendall, New York; 

 Waldemar Koch, Chicago; W. G. MaeCallum, 

 Baltimore; Wilfred H. Manwaring, Bloom- 

 ington, Ind.; J. W. D. Maury, New York; 

 F. G. Novy, Ann Arbor; W. Ophiils, San 

 Francisco; Richard M. Pearce, Albany; H. T. 

 Ricketts, Chicago ; Hermann W. Schulte, New 

 York; Charles E. Simon, Baltimore; Aldred 

 S. Warthin, Ann Arbor; Francis C. Wood, 

 New York. 



SCIENTIFIC NOTES AND NEWS 

 Sir Joseph D. Hooker, who celebrated his 

 ninetieth birthday on June 30, has been made 

 a member of the Order of Merit. 



