1054 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



long, 16 cm. broad, and 6 cm. high, and holds 500 com. of fluid. On the 

 bottom (figs. 251 and 252) are seen six oval pits, each holding 50 com. of 

 fluid. These pits communicate by narrow channels with a deepish central 



hollow, in the middle of which 

 Fig. 251. is a hole, closed when the 



vessel is in use by a plug D 



(fig. 251). The dish or tray 



is covered with a glass top C. 



The way to use this ap- 



FiG. 252. 



paratus is of course obvious; 

 the various fluids are simply 

 poured in through a funnel, 

 and after the necessary time 

 are withdrawn by removing 

 the plug D. Imbedding with 

 paraffin is executed by putting 

 some soft paraffin in the mid- 

 channel, and then transferring 

 to an incubator. When melted 

 the paraffin finds its way into 

 the egg-shaped pits, and thus 

 saturates the preparation. The excess of soft paraffin having been with- 

 drawn by removing the plug, the process is repeated with hard paraffin. 

 It is not necessary to use an incubator, a naked flame answers the purpose. 

 Celloidin or any other imbedding medium can be manipulated in the 

 Mikrolektron. After using the apparatus, it is advisable to clean out the 

 cavities and channels by the aid of heat and absolute alcohol. 



Method of Staining and Fixings the Elements of Blood.* — Eecent 

 discoveries of morphological elements in the blood hitherto unknown, as 

 well as the newly-published facts concerning its coagulation, have aroused 

 an interest in the subject which calls for an acquaintance with the methods 

 with which it is possible to follow those results. Accordingly, Miss Alice 

 L. Gaule describes the method employed in the Physiological Laboratory, 

 Zurich ; for, although it has been mentioned by Prof. Gaule in his lectures 

 for several years, it has not as yet been published. 



The methods formerly used were that of examining fresh blood, and 

 that, perfected by Ehrlich, which consisted in staining dried blood. 



* Amer. Natural., xxi. (1887) pp. 677-83. 



