384 



Journal of Applied Microscopy. 



which would keep the medusae floating, independently of their pulsations, would 

 produce good results. 



Such currents may be made by means of a glass plate suspended in the water. 

 This plate has a glass rod passing through a hole in its center, while the other 

 end of the rod is attached to a light wooden beam which works on a hinge at the 

 center, and has a small bucket, fitted with a self-emptying siphon, and supplied 



with water by means of a rubber tube 

 attached to the fresh-water supply on 

 the opposite end. 



The weights of the bucket and 

 glass plate are arranged so that the 

 plate moves up and down in the sea 

 water as the bucket alternately fills 

 and empties. The weights may be 

 delicately adjusted by means of shot 

 placed in a suitable holder at the end 

 of the beam, and in this way the 

 motion may be made as slow as desired. The length of the stroke is regulated 

 by two stops, and a slit in the cover of the jar, through which the rod passes, 

 prevents the plate from striking the sides of the jar. 



If desired, several plungers may be worked in the same way. The water may 

 be aerated, by putting a funnel with a small hole in the top, in place of the glass 

 plate. The apparatus is arranged so that the funnel comes out of the water with 

 the upward stroke of the plunger, and with the downward stroke, returns full of 

 air, which bubbles up through the water. 



Copepods, crustacean, annelidan, and molluscan larvae were put in the jars 

 as food foi»the medusae, and many of the larva; which were not eaten developed 

 to the adult form. — Nature. 



Cement for Fluid Mounts. — The note on cements for fluid mounts' in 

 the March Journal leads me to speak of the German " Maskenlack." I first 

 used it in the laboratory of Professor Kny in 1888, and glycerine mounts made 

 then are in good condition to-day. It is an alcoholic cement, but perfectly 

 satisfactory for any non-alcoholic preservatives that we have used. 

 Mt. Holyoke College. HENRIETTA E. HoOKER. 



New Biological Station. — A new station will be open at Flathead Lake, 

 Montana, during July and August. The station will be equipped for making 

 collections of either aquatic or land forms of life. There will be a laboratory 

 and facilities for photography. In addition to the advantages for study and for 

 comparison of methods in work, there will be opportunities for investigators to 

 study special groups and to make collections in remote regions. Information 

 regarding the station will be given by Professor M. J. Elrod, University of 

 Montana, Missoula, Mont. 



