CONTENTS 



PAGE 



i. THE MECHANISM OF INFECTION IN TUBERCULOSIS 335 



R. R. Armstrong, B.A., M.B., B.C. (Cantab.), 

 M.R.C.S., L.R.CP. 



2. SCIENTIFIC PROBLEMS IN RADIOTELEGRAPHY . 356 



J. A. Fleming, M.A., D.Sc., F.R.S. 



3. X-RAYS AND CRYSTALS 372 



W. L. Bragg, B.A. 

 {Illustrate I.) 



4. "MATHEMATICS AND CHEMISTRY": A REPLY . . 390 



James Riddick Partington, M.Sc. 



5. HORTICULTURAL RESEARCH.— II. Tree Pruning and 



Manuring , 397 



Spencer Pickering, F.R.S. 

 (Illustrated?) 



6. THE DISCUSSION ON ANIMAL NUTRITION AT 



DUNLEK 413 



Recorded by E. J. Russell, D.Sc. 



The Verdict of the Bullock (William Bruce).— The Dis- 

 crepancy between the Results actually obtained and 

 those expected from Chemical Analysis (Dr. F. 

 Gowland Hopkins). — Active Constituents of Grain 

 (Prof. Leonard Hill). — An Explanation of Beri-Beri 

 (Dr. Casimir Funk). — More Difficulties from the 

 Practical Side (Dr. David Wilson). — Certain Oil 

 Foods (Prof. Hendrick) — The Magnitude of the 

 Error in Nutrition Experiments (Prof. R. A. Berry). 

 — A Note of Caution (Dr. Crowther). 

 iii 



