188U.J 



MICEOSCOPICAL JOUENAL. 



iir 



the method of multiplication. This 

 takes place, usually, by repeated 

 longitudinal division, but some- 

 times the entire plasma becomes 

 transformed into numerous brood- 

 cells (according to Stein only be- 

 tween 7 and 9 A. M.) which swarm 

 out when mature. 



C. euchlorum, Ehr. L. 0.08. 

 Sometimes abundant in stagnant 

 water. 



6. Gen. Zygoselmis, I^^.l- Body 

 of variable but slowly changing 

 form, without pigment spot, with 

 two slowly moving flagella. 



Z. nehulosa, Duj. Body color- 

 less, with gray or green granules. 

 L. 0.02. In ditch water, not com- 

 mon. 



7. Gen. Dinema, Pty. Similar 

 to if not identical with the pre- 

 ceding species. The distinction is 

 found in the fact that one flagellum 

 lashes, the other trails. 



D. grisiola, P. Among algae, 

 not abundant. 



8. Gen. Colacium, Ehr. Indi- 

 viduals with the pointed hinder end 

 fixed, sometimes in shrub-like fami- 

 lies. Flagella not apparent. 



C. vesiculosum, Ehr. L. 0.03. 

 Usually on Cyclops quadricornis. 



EDITORIAL. 



Although we printed a large 

 edition of the January number of 

 the JouKNAL, we are obliged to an- 

 nounce that we have but lew copies 

 remaining ; and it is very doubtful 

 if we can fill orders for the first two 

 numbers after three or four months 

 from this time. For this reason, 

 all subscriptions hereafter received, 

 will begin with the March number, 

 unless the subscribers expressly 

 order from January. Single copies 

 of January and February numbers 

 will not be sold hereafter. 



Sub-Section of Microscopy, 

 of the A. A. A. S. 



Dr. S. A. Lattimore, Chairman 

 of the Sub-section of Microscopy 

 of the American Association for 

 the Advancement of Science, which 

 is to meet at Boston, August 25th, 

 desires us to announce that the Lo- 

 cal Committee has made the most 

 complete and ample arrangements 

 for the accommodation of the Sub- 

 section. The entire Physical and 

 Biological Laboratories in the Insti- 

 tute of Technology will be placed 

 at its service ; and in addition, two 

 large rooms may be used, which are 

 well adapted for lantern-exhibitions 

 of any kind, day or evening. 



Ample arrangements will be 

 made for the display of microscopes 

 and accessories, as well as for their 

 safe keeping during the session, 

 without trouble or care to the 

 owners. 



It is hoped that the efforts of the 

 Local Committee will be rewarded 

 by a large attendance of the micro- 

 scopists of the Association ; and that 

 they will induce many others to seek 

 admission to the Association. 



Catalogue of the DiatomaceaB. 



We have recently issued a circu- 

 lar advertising Mr. Ilabirshaw's 

 " Catalogue of the Diatomacege ; " 

 and it is our present intention to 

 begin work on the first part some- 

 time this month. The four parts 

 are to be issued in rapid succession, 

 and as only a small number of ex- 

 tra copies will be printed, those who 

 intend to subscribe should do so 

 immediately. 



We especially desire to call the 

 attention of librarians to this work. 

 It is one that should be in ever^ 

 library of scientific books, for it 

 will be a work of reference of very 

 great value. 



