Contents. v 



No. PAGE 



XXVII. — Unsound Mendelian Developments, especially as regards the 

 Presence and Absence Theory. By James Wilson, m.a., b.sc. 

 (December IB, 1912.) . . . . .399 



XXVIII. — Osmotic Pressures in Plants. I. — Methods of Extracting Sap 

 from Plant Organs. By Heney H. Dixon, sc.d., f.e.s., and 

 W. E. G. Atkins, m.a., a.i.c. (February 8, 1913.) . . 422 



XXIX. — Osmotic Pressures in Plants. II. — Cryoscopic and Conductivity 

 Measurements on some Vegetable Saps. By Heney H. Dixon, 

 SC.D., F.B.S., and W. R. G. Atkins, m.a., a.i.o. (February 8, 



1913.) 434 



XXX. — A Method of Microscopic Measurement. By J. Joly, sc.d., f.e.s. 



(February 7, 1918.) . . . . . .441 



XXXI. — The Melting-Points of some of the Rarer Minerals. By Aenold 



L. Fletohee, m.a., b.e. (February 15, 1918.) . . 443 



XXXII. — A Refined Method of obtaining Sublimates. By Aenold L. 



Fletohee, m.a., b.e. (February 17, 1913.) . . . 460 



XXXIII. — On the Germination of the Seeds of some Dicotyledons. By 

 J. Adams, m.a. (Cantab.). (Plate XXXIV.) (February 21, 

 (1913.) ....... 467 



XXXIV. — On Bothrodendron (Cyclostigma) kiltorkense, Haughton, sp. By 

 T. Johnson, d.sc, f.l.s. (Plates XXXV.-XLI.) (March 20, 

 1913.) . . . . . . .500 



XXXV. — On the Rotting of Potato Tubers by a new species of 

 Phytophthora having a method of Sexual Reproduction 

 hitherto undescribed. By Geoege H. Pethybeidge, ph.d., 

 B.sc. (Plates XLII.-XLIV.) (March 26, 1913.) . . 529 



XXXVI. — On Pure Cultures of Phytophthora infestans De Bary, and the 

 Development of Oospores. By Geoege H. Pethybeidge, 

 PH.D., B.sc, and Paul A. Murphy, a.e.c.sc.i. (Plates XLV. 

 and XLVI.) (March 26, 1913.) . . . .566 



XXXVII.— Inter-Alternative as opposed to Coupled Mendelian Factors : A 

 Solution of the Agouti-Black Colour in Rabbits. By 

 James Wilson, m.a., b.so. (March 27, 1913.) . . 589 



XXXVIII. — Notes on Recent Pampa and other Formations in Patagonia. By 



E. G. Fenton. (Plate XLVII.) (May 15, 1918.) . 600 



XXXIX.— On the Influence of Self-induction on the Spark Spectra of 

 Certain Non-Metallic Elements. By Genevieve V. Moerow, 

 A.E.C.SC.I. (Plates XLVIII.-LI.) (May 19, 1913.) . 607 



