108 THE AMERICAN MONTHLY [March 



animal and is vised to cement grains of sand and other ma- 

 terial into the proper form of house for this particular 

 species. 



Each species has its own form of habitation and it is 

 rare to find them departing- from it. The animal is well 

 illustrated in Leidy's Rhizopods. 



MICROSCOPICAL NOTES. 



Meeting of American Medical Publishers' Association. 



— The Fourth Annual Meeting- of the American Medical 

 Publishers' Association will be held in Philadelphia, on 

 Monday, May 31st, 1897 (the day preceding the meeting of 

 the American Medical Association). Editors and publish- 

 ers, as well as everyone interested in Medical Journeilism, 

 cordially invited to attend, and participate in the delibera- 

 tions. Several very excellent papers are already assured, 

 but more are desired. In order to secure a place on the 

 prog-ram, contributors, should send titles of their papers 

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

 Mo. 



NEW PUBLICATIONS. 



Bacteria in Rocks. — M. B. Renault has long- worked at 

 the indications of bacteria found in g-eolog-ical strata, and 

 now publishes the g-eneral result of his observations in a 

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

 might be expected from their simple structure, bacteria 

 appear to have been coeval with the first appearance of 

 organic life on the earth, the coccoid form being- appar- 

 ently earlier than the bacillar. Indications of their pres- 

 ence are found in bone, teeth, scales and coprolites, as well 

 as abundantly in veg-etable tissues, the spores and spor- 

 anges of ferns appearing- to have been especially subject 

 to their attacks. The species are, as a rule, distinct from 

 those at present in existence. — Ann. des Sciences Nat- 

 urelles. 



