los THE A3IERICAN MONTHLY [Miiich 



;inim;il anil is used to ceiiK'iU grains ol sanil and other ma- 

 terial into the ]>roper form of house for this particular 

 s|)ecies. 



Kach species has its own form of habitation and it is 

 rare to find them departini>;- from it. The animal is well 

 illustrated in Leid\'s KIii/o])()ds. 



MICKOSCOrKAI. NOTES. 



Meeting of American Medical Publishers' Association. 

 — 'i'he Fourth Annual Meeting- of the American Medical 

 Publishers' Association will be held in Philadelphia, on 

 Monday, May .^Ist, 1S')7 'the day precedint^- the meetinj^- of 

 the American Medical Association >. Kditors and publish- 

 ers, as well as everyone interested in Medical Journalism, 

 cordiallv in\ited to attend, and partici])ate in the delibera- 

 tions. Several very excellent pa])ers are already assured, 

 Init more are desired. In order to secure a ]>lace on the 

 prog^ram, contrii)utors, should send titles of their pa])ers 

 at once to the Secretarv, Chas. Wood Fassett, St. Joseph, 

 Mo. 



NEW PUBLICATIONS. 



Bacteria in Rocks.- AL B. Renault has lon'if worked at 

 the indications of bacteria found in *4-et)lo^ical strata, and 

 now i)ul)lishes the j^'eneral result of his obser\ations in a 

 paper illustrated with a larg'e number of drawinjj-s. As 

 miifht l)e ex])ected from their simjde structure, bacteria 

 appear to ha\e been coe\al with the first ap])earance of 

 ors^anic life on the earth, the coccoid form I)einj4- appar- 

 entlv earlier than the bacillar. Indications of their pres- 

 ence are found in bone, teeth, scales and co])rolites, as well 

 as abundantly in veji^i^etable tissues, the sjxjres and spor- 

 anjj-es of ferns appearinjn" to have been especially subject 

 to their attacks. ^Phe s])ecies are, as a rule, distinct from 

 those at ]ires(nl in ^-xistence. Ann. di's Sciences Nat- 

 u relies. 



