1894.] MICROSCOPICAL JOURNAL. 195 



ning branch at AVhistler, Ala., distant five miles north of 

 Mobile, from which I expressed a quantity of liquid and 

 sediment, (a test showing diatoms) which I saved in a 

 bottle and took to Mobile on April 25, 1894 ; and on the 

 evening of the day the specimen was secured, I made a 

 concentration, and on microscopic inspection I found as- 

 sociated in the material species of Navicula major, N. 

 divergens, N. viridis, !N". viridula, vSurirella splendida, 

 Nitzschia sigma, Eunotia major, etc., and many species 

 of true infusoria, ciliated, flagellate and non flagellate, 

 associated with them, and also occurring in profusion. 

 Beginning the study with some fine specimens of Navic- 

 ula divergens,. I noted that progression through the 

 water was made equally as well when the sutural side 

 was presented to view, as when the raphe bearing side 

 was presented, and that generally when two frustules 

 before complete autofission were travelling, the sutural 

 sides were shown in preference to the valvular aspect and 

 in their incessant change of place and position, grains of 

 sand were snapped up, twirled about or transported by 

 the ectoderm, (epidermis) or outside envelope of the 

 frustule, each and every new Navicula showing some- 

 thing of interest in its actions. 



Substituting for study, a Navicula major, I endeavored 

 to note and observe the behavior of the living bacterial 

 forms and minuter monad-like infusoria when passing 

 the central nodules of the diatom, which are seen edge- 

 wise when the sutural zone is in view, as it was at these 

 points that a form of molecular activity had been noted, 

 as well as figured by Prof. Smith in his study, which in- 

 dicated that very close to, and opposite the two nodules, 

 small balls of indigo particles were being constantly 

 formed, and after a while dispersed at these points. In- 

 stead of construing these molecular movements as at- 

 tributable to a probable operation of the vorticellate 

 power of cilia?, which power is readily recognized in 



