This journal provides immediate access to some articles. Volume 10(2); February 1924 Mathematics Sets of Completely Independent Postulates for Cyclic Order PMCID: PMC1085517 Physics The Scattering of X-Rays and Bragg's Law PMCID: PMC1085513 Refraction of X-Rays in Pyrites PMCID: PMC1085514 Statistics The Development of a Frequency Function and Some Comments of Curve Fitting PMCID: PMC1085518 Zoölogy The Effects of Replacing the Cephalic End of the Embryonic Spinal Cord by an Extraneous Medulla in Amblystoma PMCID: PMC1085515 Some Unexpected Results of the Heteroplastic Transplantation of Limbs PMCID: PMC1085516 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||