56 The Microscope. 



Through another correspondent, a Professor of Natural Science 

 suggests that I have seen not the streaming of protoplasm but 

 — osmosis ! I ! ! 



IN Bulletin No. 76 of the New Jersey Agricultural College 

 Experiment Station, Prof Byron D. Halstead publishes 

 important observations on " Some Fungous Diseases of the Sweet 

 Potato," that the reader will find of interest, and of great 

 value if he is engaged in the cultivation or even in the preserva- 

 tion of the roots. The pamphlet is distributed free to all that 

 apply at the N. J. Agricultural College, New Brunswick, N. J. 



AcKNOWLELGMENT. — To Dr F. A. Rogcrs, Brewster, Mass., for a 

 water color drawing of blood corpuscles to illustrate his method 

 of differential staining, to be published in The Microscope next 

 month. — To Mr F. E. Ives, Philadelphia, for a fine photo-niicro- 

 graph of bacillus iuhefcidods in spore, magnified 1000 diameters. 

 — To Mr E, W. Sharp, Philadelphia, for a superb mount of the 

 " lady bug," Coccinella, prepared by his carbolic acid method, also 

 to be published in The Microscope for March. 



NCV/S • rRO/A- 

 THE Vv'ORKEI^S 



AcTiNOSPHiERiuM EiCHHOKNii^ — In a Small pond near the ob- 

 servatory of the State University of Iowa, I collected some ma- 

 terial which now stands on a table in the laboratory. Minute 

 whitish disks, plainly visible however to the unaided eye, may 

 be seen in considerable numbers clinging to the stems and leaves 

 of Ceratophyllum. An examination of these disks reveals the fact 

 that they are gigantic Rhizopods belonging to the genus Adinos- 

 phierium. A. Eichhornii they probably are, but they are vastly 

 larger than any individuals of this species usually seen, and 

 larger than any recorded by Prof Leidy in his work on the 

 •• Fresh water Rhizopods of North America." The first specimen 



1 S. Calvin. Bui. Biol. Lab , State Univ. la. 



