142 



BIOLOGICAL SOCIETY OF WASHINGTON. 



Page. 



Salmon, Dr. D. E., and Dr. Theobald Smith. 

 A new method of producing immunity 



from contagious diseases vii 



Notes on some biological analyses of 



Potomac drinking-water viii 



Saturday lectures, 1886 xxii 



Saturday lectures, 1887 xxiii 



Scudder, N. P., the period of gestation in the 



common caged white mouse xix 



Seaman, Prof. W. H., notes on Marsilia quad- 



rifolia xi 



Sexual characters in the Deltoids viii 



Siren, vertebrte of ix 



Shufeldt, Dr. R. W., some early, and as yet 



unpublished, drawings of Audubon viii 



Smith, .John B., some peculiar secondary sex- 

 ual characters in the Deltoids and 



their supposed functions viii 



Ant's nests and their inhabitants ix 



Abnormal abundance of Dyuastes tityus x 



Some geographical variations of insects .... xix 

 Smith, Dr. Theobald, parasitic bacteria and 



their relation to Saprophytes xii 



Quantitive variations in the germ life of 



Potomac water during 1886 xvi 



Peptonizing ferments among bacteria xx 



Smith, Dr. Theobald, and Dr. D. E. Salmon, 

 a new method of producing immunity 



from contagious disease vii 



Notes on some biological analyses of Po- 

 tomac drinking-water viii 



Snake, new species from District of CoUimbia, xiv 

 Solenodon cubanus, exhibition of a living 



specimen of x 



Stearns, Prof. K. E. C, instances of the ef- 

 fects of musical sounds on animals ix 



The asclepiad plant (Araujia albans) as a 



butterfly catcher xiv 



The protective devices of the carrier shell, 



Xenophora xviii 



Stejneger, Leonhard, new birds froni the 



Sandwich Islands xiv 



How the gi-eat northern sea cow (Rhytina) 



became exterminated.. xxi 



Sturnella magna and S. neglecta, overlapping 



habitats in Iowa xxi 



" Sulphur shower" xvii 



Sweden, recent progress of zoology in xi 



T. 



Tseniosomous fishes x 



Temperature charts of Atlantic coast surface 

 water.. xiii 



Paj 

 Thyrsitops, new species from the New England 



fishing banks 3 



Timber Inie of Pike's Peak.. 



Tropidonotus bisectus 3 



Trout of North America 



True, F. W., some distinctive cranial char- 

 acters of the Canadian lynx 



A revision of the genus Lagenorhynchus... 

 Exhibition of a living Solenodon cu- 

 banus 



The blackfish of our southern waters 3 



Review of some of the more important 

 works on cetaceans piiblished since 1886. 

 Trybom, Dr. Filip, on recent progre.ss of zool- 

 ogy in Sweden 



Turkey buzzard, sense of smell in 



V. 



Van Diemen, H. E., the Japanese persimmon 



(Diospyros kaki) 3 



Exhibition of cluster of fruit of the date 



palm (Phcenix dactylifera) 



Vasey, Dr. George, new and recent species of 



North American grasses 



A recent collection of Mexican grasses 



made by Dr. E. Palmer : 



Notes on western grasses xi 



Vespertilio ciliolabrum xii, ] 



w. 



Walcott, C. D., crustacean tracks found on 

 strata of upper Cambrian (Potsdam) age. 

 A fossil lingula preserving the cast of 

 the peduncle, from the Hudson Ter- 



rane, near Rome, N. Y 



Exhibition of section of fossil endoceros 



over eight feet in length 1 



Ward, Prof. Lester F., the plane tree and its 



ancestors 



Exhibition of specimen of the Palo la 



Cruz, or wood of the cross 



Autumnal hues of the Columbian flora 



White, Dr. C. A., the rapid disappearance of 



the shed antlers of the Cervidse 



Wortman, J. L. , and Dr. Frank Baker on recent 

 investigations into the mechanism of the el- 

 bow joint ■^ 



X. 



Xenophora, protective devices in x^ 



