222 THE AMERICAN MONTHLY [September, 



periments. he found that an analogous reaction takes ph\ce with 

 certain granular elements of the blood. That Ehrlich's researches 

 are not better known is due to the fact that until last year his 

 published observations were scattered through the different medi- 

 cal journals ; but now he has collected them into a volume, 

 " The Histology and Clinic of the Blood and Relations to Color 

 Analysis." 



Mr. Freund's paper gave a very careful resume of the subject, 

 and he explained to his hearers his own method of preparing, 

 staining, and mounting blood. His paper was further illustrated 

 by a number of preparations shown under microscopic amplifica- 

 tion of i,300 to 2.000 diameters. Among these were two beauti- 

 ful slides prepared by Dr. Bein of Berlin. 



After the reading of the paper an interesting discussion took 

 place, in which Dr. Wythe, Dr. Sanderson, and others took part. 

 It was asked whether any ante-mortefn treatment of the blood 

 would facilitate its study, to which Dr. Wythe replied that a 

 guinea-pig could be fed for weeks with sulpho-cai'bolate of soda 

 in its food, and when killed the blood could be treated with num- 

 erous reactionary elements, which would yield beautiful and per- 

 manent stains. 



The next meeting of the society, two weeks hence, will be for 

 a public exhibition, when, it is anticipated, many interesting ob- 

 jects will be shown. 



May i8^ i8g2. — The members and friends of the society, num- 

 bering about seventy persons, responded to the invitation to attend 

 the first public exhibition to which ladies were admitted since the 

 society has occupied its present quarters at 432 Montgomery 

 street. Although the night was uncomfortably warm, the inter- 

 est in the exhibit never flagged, and every one went away feeling 

 amply repaid. 



The names of the exhibitors, with their principal exhibits, were 

 as follows : 



Dr. S. M. Mouser showed the circulation of the blood in the 

 mesentery of the living frog. Although this wonderful operation 

 of nature has often been shown, it is generally the chief attrac- 

 tion. 



Dr. Henry E. Sanderson exhibited half a dozen anatomical 

 preparations from man and the lower animals of his own mount- 

 ing. 



Charles C. Riedy showed some gorgeous opaque objects, a 

 slide of arranged butterfly scales, gold-plated diatoms and the 

 diamond beetle being the chief attractions. 



A. H. Breckenfeld made a successful exhibit of living fresh- 

 water organisms, such as infusoria, polyzoa, mites, etc. 



E. W. Runvon had on his stand various polarizing objects, in- 

 cluding human hair, crystals of strychnia, and fibers from Egyptian 

 mummy-cloth. 



A, M. Hickox showed some brilliant objects with polarized 

 light, including oxalic-acid crystals, sugar crystals, quartz, etc. 



