382 



SCIENCE 



[Vol. LVI, Xo, l-iJO 



be given at three o'clock on Sunday afternoons, 

 in the auditorium of the Academy's Museum 

 in Golden Gate Park, San Francisco, as fol- 

 lows ; 



October 1. The Experimental Method in Ani- 

 mal Psychology: Dr. Samuel J. Holmes, pro- 

 fessor of zoology, University of California. 



October 8. Equilibration of Animals and 

 Aviators: Dr. Samuel S. Maxwell, professor of 

 physiology. University of California. 



October 15. The Use of Andmals in the Diag- 

 nosis and Prevention of Disease: Dr. Carl, A. L. 

 Schmidt, associate professor of biochemistry. 

 University of California. 



October 22. Animal Experimentation: Dr. 

 T. D. Beckwith, professor of bacteriology, Uni- 

 versity of California. 



Oetofber 20. Animal Foes of the Human Body 

 and How to Control Them : Dr. Charles A. Kof oid, 

 professor of zoology, University of California. 



November 5. Wljat Animal Experimentation 

 Has Done for Childhood: Dr. E. C. Pleischncr, 

 clinical professor of pediatrics, University of 

 California. 



These lectures are all masters in their re- 

 spective subjects. What they have to say will 

 not onl}^ be authoritative and up to date, but 

 will be presented in a popular and convincing 

 manner. These lectures, -which will be illus- 

 trated, are offered by the California Academy 

 of Sciences, free to the public, as one of the 

 several educational activities in which it is en- 



THE SILLIMAN LECTURES OF YALE 

 UNIVERSITY 



This year's Silliman Memorial Lectures at 

 Yale University will be delivered by Dr. 

 August Krogh, professor of zoophysiology in 

 Copenhagen University. Professor Krogh has 

 taken for his general topic "The Anatomy and 

 Physiology of Capillaries," and will speak on 

 the following subjects on the dates given: 



October 5 : " The Distribution and Kumber of 

 Capillaries in Selected Tissues. The Evidence of 

 Their Independent Contractility. 



October 6 : " The Histological Structure and 

 Innervation of the Capillary Wall. ' ' 



October 9 : " Tlie Reactions of Capillaries to 

 Stimuli. The Hormonel Control of Capillary Cir- 

 culation. ' ' 



October 10 : " The Mechanism of Some Capil- 



lary Reactions, especially in the Human Skin." 

 October 11: "The Exchange of Substances 



through the Capillary "Wall." 



October 12; "Some Problems of Capillary 



Physiology and Patholog.y. " 



Professor Krogh has a large amount of en- 

 tirely new material to present which should 

 prove of importance to all those branches of 

 science which concern the circulation of the 

 blood. At the time of the award of the Note! 

 Prize to Dr. Krogh in 1920 his work on capil- 

 laries was regarded as only beginning, and 

 since that time his researches in this field have 

 been pushed ahead with rapidity and success. 

 The results of these researches will be made 

 public for the first time in the Silliman lectures. 



In a recent article in The Scientific Monthly, 

 Dr. AV. E. Miles, of the Nutrition Laboratory 

 of the Carnegie Institution of Washington, 

 gave the following resmne of Dr. Krogh's 

 career to date: 



Dr. Krogh is scarcely forty-five years old. He 

 received his educational and scientific training in 

 Denmark and is a son of wliom that country can 

 well be proud. For a number of years after re- 

 ceiring liis degree and serving as laboratory 

 assistant to Professor Christian Bohr no suitable 

 teaching or research position opened to him in 

 Denmark. However, he refused to accept such a 

 position in any other country. He made two ex- 

 peditions to Greenland, the first to study the 

 tension of carbon-dioxide in ocean water and the 

 second to investigate the respiratory metabolism 

 of the Eskimos. Thus, without any laboratory 

 facilities, he literally plunged into research. A 

 study on the expiration of free nitrogen from 

 the bodj' v.-as recognized as so important as to 

 receive the Seegen Prize of the Imperial Academy 

 of Sciences in Vienna. He was appointed a lee- 

 turci' in ph_ysiology under the science faculty of 

 the Coi^enhagen University in 1908 and was pro- 

 vided with a small laboratory in the fall of 1910. 

 It is in this laboratory that most of his scientific 

 work has been done. A visitor will gain the im- 

 pression that his laboratory facilities are rather 

 meager us regards both room and equipment and 

 that he does not have adequate assistance. Cer- 

 tainly it would be a most worth while investment 

 to provide such a man with all the assistance he 

 can comfortably direct. His researches have cov- 

 ered a wide range and have been singularly con- 

 cise and complete. He is a master technician, a 



