Contents. vii 



No. PAGE 



44. Notes on the Filtration and other Errors in the Determination 

 of the Hydrogen Ion Concentration of Soils. By W. R. G. 

 Atkins, sc.d. (July, 1924.) . . . . .341 



45! Variations in the Pei-meability of Leaf Cells. By H. H. Dixon, 

 SC.D., F.R.S., Professor of Botany in the University of Dublin. 

 (July, 1924.) 349 



46. Notes on Acarine or Isle of Wight Bee Disease. By Lieut.-Col. 



C. Samman, e.a.m.c. ; and J. BrontIj Uatenby, m.a. (duel.), 

 D.PHIL, (oxon.), d.sc. (lond.), M.R.I.A., F.R.M.S., Professor of 

 Zoology and Comparative Anatomy in the University of 

 Dublin. (Plates XVIII and XIX.) (August, 1924.) . . 857 



47. Note on a Physical Method of Separating the Fats in Butter-Pat. 



By F. E. Hackett, m.a., ph.d., Professor of Physics, College 



of Science, Dublin. (Aug-ust, 1924.) . . . .365 



