August 31, 1900.] 



SCIENCE. 



337 



ground course of some of these waters to 

 their issue in springs at lower levels, with 

 unexpected results, which throw much 

 light on the general question of the per- 

 colation of waters through rock-fissures. 

 The committee will present its report dur- 

 ing the meeting, and excursions are being 

 planned to visit the site of the experiments. 

 As usual, glacial subjects will receive due 

 attention, among the papers already prom- 

 ised being one on the glaciation of the Aire 

 Valley by Messrs. H. Muff and A. Jowett, 

 while others are expected on the glacial 

 phenomena of Snowdon and on a similar 

 subject in parts of the East Kiding of 

 Yorkshire. Three of the reports of com- 

 mittees of research will also afford scope 

 for the discussion of glacial matters, viz: 

 That on the erratic blocks of the British 

 Isles, that on the conditions of occurrence 

 of Irish elk-remains in the Isle of Man, and 

 that on the Pleistocene deposits of Canada. 

 The last mentioned, which is the final re- 

 port of a committee appointed at the To- 

 ronto meeting of the Association, is likely 

 to receive particular attention, as it em- 

 bodies strong evidence in favor of the 

 much-disputed occurrence of an inter-gla- 

 cial period. It is expected that Professor 

 A. P. Coleman, of Toronto University, who 

 has been most active in the last mentioned 

 committee, will attend in person to read 

 the report. The same gentleman will also 

 read a paper on the recent discovery of a 

 ferriferous horizon in the Huronian rocks 

 in Ontario, north of Lake Superior— a dis- 

 covery which may eventually prove of great 

 economic consequence. Cave- exploration 

 in Ireland and at Uphill, near Weston- 

 super-Mare, will be reported on by two 

 committees of the Association. A further 

 contribution to our knowledge of the geol- 

 ogy of Anglesey will be made by Mr. E. 

 Greenley, and Mr. Vaughan Cornish will 

 bring forward the new results of his study 

 of ripple-marks. In short, all the indica- 



tions point to a profitable and enjoyable 

 week for the geologists who visit Bradford. 



Dr. R. H. Traquair will be president of 

 Section D (Zoology), with which, on this 

 occasion , Physiology will be combined . Dr. 

 Traquair in his address, will deal with the 

 ' Bearing of Fossil Ichthyology on the Doc- 

 trine of Descent.' Major Ronald Ross will 

 contribute a paper on ' Malaria and Mos- 

 quitoes '; Messrs Gamble and Keeble on 

 ' The Color Physiology of certain Marine 

 Crustacea ' ; Professor L. C. Miall on ' The 

 Respiration of Aquatic Insects.' In addi- 

 tion there will be, as usual, a number of 

 communications of a more special character 

 in all branches of natural history, together 

 with the reports of various committees on 

 the results of exploration and research. 



Section E (Geography) will be presided 

 over by Sir George Robertson, whose ad- 

 dress will deal mainly with certain geo- 

 graphical aspects of the British Empire. 

 He is likely to have much to say on the im- 

 portant element of distance and its diminu- 

 tion by means of improved communications. 

 This Section is likely to be as attractive as 

 usual. Sir Thomas Holdich will deal with 

 the important subject of railway connection 

 between Europe and Asia. Captain Deasy, 

 Captain E. S. Grogan, and Mr. Borchgre- 

 vinck will repeat the story of their various 

 expeditions in Asia, Africa and the Antarc- 

 tic. Mr. E. G. Ravenstein and Mr. B. V. 

 Darbishire are both to deal with the subject 

 of colonial and foreign surveys. Mr. G. 

 G. Chisholm has undertaken to deal with 

 the important subject of the probable eco- 

 nomic relations of Siberia and China. 

 There will be one or two papers on the po- 

 sition of geographical teaching in Bradford 

 and the neighborhood. Dr. H. R. Mill 

 will deal with the geography of South-West 

 Sussex, and Mr. E. Heawood with the com- 

 mercial resources of Africa. 



Section F (Economic Science and Sta- 

 tistics) will have as its president Major P. 



