September 15, 1905.] 



SCIENCE. 



333 



mals, fails to give rise to any symptoms of 

 the disease. Horse-sickness blood filtered 

 through a porcelain filter is still infective ; 

 the opposite holds good up to the present 

 with heart-water. Horse-sickness blood can 

 be kept for years without losing its viru- 

 lence ; heart-water blood loses it in forty- 

 eight hours. 



Heart-water has a peculiar distribution, 

 being restricted to the certain tracts of 

 country with a warm, moist climate. It is 

 known to farmers that if they remove their 

 flocks to the high veld the disease dies out. 



To Lounsbury is due the credit of ex- 

 plaining these facts. He found that the 

 disease is carried from sick to healthy ani- 

 mals by means of the bont tick, Anibly- 

 omma liebrceum. This tick leaves its host 

 between each molting, and a larva which 

 sucks the blood of an infected animal is 

 capable of giving rise to the disease in a 

 susceptible animal as either a nympha or 

 imago. The distribution of this tick corre- 

 sponds to the distribution of the disease. 

 If this tick could be killed off, the disease 

 would disappear from the country. This 

 could doubtless be done on individual farms 

 by long-continued dipping; but in the 

 meantime some method of immunization 

 might be devised. 



D. Bruce. 



THE AMERICAN ASSOCIATION FOR THE ■ 

 ADVANCEMENT OF SCIENCE. 



SUMMER MEETING OF SECTION C. GEOLOGY 

 AND GEOGRAPHY. 



The section of geology and geography 

 (Section E) of the American Association 

 for the Advancement of Science held a 

 summer field meeting at and near Syra- 

 cuse, N. Y., July 19 to 22, inclusive, in 

 conjunction Avith the intercollegiate sum- 

 mer courses in geology. Although the at- 

 tendance was not large, it was fairly satis- 

 factory, and as many participated in the 

 daily excursions as could be cared for con- 



veniently on foot. The heat of the early 

 part of the week moderated somewhat by 

 Thursday, the first field day of the meeting, 

 and good weather prevailed during the 

 sessions. 



The opening session Avas held on Wednes- 

 day evening in the chapel of the College 

 of Liberal Arts of Syracuse University, 

 and was called to order by the secretary of 

 the section, who introduced as chairman of 

 the meeting Professor William North Rice, 

 of Middletown, Conn., in place of Pro- 

 fessor E. A. Smith, of University, Ala., 

 chairman of the section and vice-president 

 of the association for 1905, who was ab- 

 sent on account of his duties as state geol- 

 ogist of Alabama. Addresses of welcome 

 were delivered by Mayor Alan C. Fobes 

 in behalf of the city of Syracuse, by Dean 

 Frank C. Smalley in behalf of Syracuse 

 University and by Dr. John van Duyn in 

 behalf of the University Club. After a 

 felicitous reply by the chairman, Professor 

 T. C. Hopkins, of Syracuse University, 

 briefly outlined the program of work and 

 excursions for the succeeding days and 

 gave a concise sketch of the geology of the 

 vicinity of Syracuse. 



On Thursday the members and others in 

 attendance divided for convenience into 

 two parties, one of which, under the guid- 

 ance of Professor Hopkins, devoted its at- 

 tention during the morning to problems of 

 stratigraphy near Jamesville, southeast of 

 Syracuse, while the other, under the leader- 

 ship of Professor H. L. Fairchild, of 

 Rochester, studied the great Railroad 

 Channel and other river channels formed 

 during the recession from central New York 

 state of the ice of the glacial epoch. The 

 two parties met about noon at Green Lake 

 near Jamesville and, after luncheon, lis- 

 tened to an exposition of ' The Local Glacial 

 Features,' by Professor Fairchild. The 

 most striking of these features are the 

 drumlins, which have long been familiar to 



