1880.] 



MICROSCOPICAL JOURNAL. 



169 



Treasurer— Geo. E. Fell, Buf- 

 falo, N. Y. 



Executive Committee — W. H. 

 Brearley, J. H. Fisher, Prof. Albert 

 II. Chester. 



The report was adopted. 



" Demonstration of Capillary 

 Circulation in Man," was the title 

 of a paper by Dr. D. C. Hawxhurst 

 of Battle (jreek. He explained a 

 process for demonstrating the flow 

 of blood in the capillary vessels of 

 the human lip. It had been possi- 

 ble to do this in some of the lower 

 animals, but never before had any 

 one been able to exhibit the capil- 

 lary circulation in any part of 

 the human body. The lower lip 

 was rolled over a support and the 

 lens adjusted to it. Proper means 

 were taken to steady the head. 

 Clamps were applied to the lijjs so 

 as to cause an engorgement of the 

 capillary vessels. The method was 

 that of a German scientist. Strongly 

 condensed daylight or gas-light was 

 best. A power of about fifty di- 

 ameters was used. The course of 

 the blood could be seen, seeming to 

 the observer as if shown through 

 a veil. A bit of ice applied to the 

 surface of the lip arrested for a 

 time the capillary flow. The speaker 

 related many other interesting ex- 

 periments, explaining the results 

 attained by treating the lip with 

 chloroform, ammonia, acids, glycer- 

 in, etc. 



Dr. Carl Seller thought the 

 powers used in this method were 

 too low to be made useful in dis- 

 covering changes in the blood-cor- 

 puscles. He thought the discov- 

 ery was more in the nature of a 

 prettv experiment than anything 

 of scientific value. 



Dr. Hawxhurst thought after con- 

 siderable practice results could be 

 obtained which a novice could not 

 discover. 



" Improvement in Microscope 



Stage" was the subject of a short 

 address by Dr. Carl Seller of Phila- 

 delphia. He said that last year, at a 

 meeting of the Society, he set forth 

 the necessity for certain improve- 

 ments in the microscope of the 

 future, one of which was an in- 

 creased movement of the stage, 

 giving at least four inches play in 

 each direction. Mr. Walmsley, 

 agent for R. & J. Beck of London, 

 had a binocular made by that Eng- 

 lish fii-m, embodying the improve- 

 ments suggested. Dr. Seller ex- 

 hibited the instrument, which he 

 said was particularly valuable in ex- 

 amining large specimens, such as 

 sections of tumors, the vocal or- 

 gans, or anything requiring a large 

 stage movement to bring all parts 

 of the specimen successively into 



V. H. Bulloch (of Chicago), 

 thought as good an instrument could 

 be made in this country. 



Dr. Seller said one could not be 

 made so cheaply. 



Mr. Bulloch described briefly 

 a microscope specially arranged for 

 examining rock sections, with im- 

 proved facilities for minute meas- 

 urements, stage adapted to this 

 particular purpose, better methods 

 of illumination for opaque objects, 

 etc. ; also a new section-cutter, by 

 which he could cut sections one- 

 thousandth of an inch in thickness. 



E. II. Griffith, of the Griffith 

 Club of Microscopy, described the 

 Club's portable microscope. He 

 produced a little morocco-covered 

 case, from which he took a number 

 of disjointed parts of a microscope. 

 These he rapidly placed together, 

 and when the instrument was 

 mounted the unscientific query as 

 to how so large a microscope could 

 be packed away in so small a 

 box, came to the surface. 



The fii-st paper of the aftenioon, 

 and the last oiie of the session, was 



