•) 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



plate A has twenty grooves R, to receive twenty slides and forty cover- 

 slips. Parallel to the plate A and inside the box is another plate B 

 provided with the same number of same sized grooves ; by means of the 

 | ( ,iilt ami a >\ tin's plate is connected with the screw *. If the screw is 

 turned the plate 15 can be brought nearer or farther away from the fixed 

 plate A. One of the grooved plates carries at its lower margin and on 

 the inner surface a line thread which projects 5 mm. over the surface, 

 and so serves to prevent the plate from falling down into the deposit of 

 stain at the bottom of the vessel. The movable plate B has at either 

 side two notches, to facilitate the circulation of the staining solution, 

 washing fluid, etc. Various sized and shaped glasses can be placed 



Fig. 183. 



upright in the box ; the size of the slide for which it is to be adjusted 

 being engraved on a scale sk in mm. 



The advantages claimed for this apparatus are that it can be used 

 for slides or coverslips ; that, by adjusting the screw, the slides and slips 

 can be held fast in the grooves, and do not fall out when the various 

 m;i in fluids are poured off ; and also with one apparatus a quantity of 

 material fixed to slides can be treated in a short space of time. 



Examination of the Retina of the Nautilus and certain Di- 

 branchiate Cephalopods.* — H. Merton found that retinae of these animals 

 did not stain by the usual nuclear and plasma dyes ; with Delafield's 

 hematoxylin he obtained only a diffuse staining, and with borax-carmine 

 he had no result, but he was more fortunate with the stronger staining 



* Zeitschr. wiss. Zool., lxxix. (1905) p. 32<J. 



