750 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



of the thoracic ganglion was studied by means of reconstruction. The 

 sections were drawn by means of a camera-hicida on Bristol board of a 

 thickness proportional to the magnification. They were afterwards cut 

 out and seccotined together. The resulting model was trimmed and 

 soaked in melted paraffin, taken out and dipped several times till a thin 

 coat of paraffin covered the model. This was then trimmed down to 

 the original size, all the interstices having been filled with paraffin. 

 After a coating of graphite it was electrotyped in copper. In this way 

 a permanent model was obtained. 



(4) Staining: and Injecting-. 



Apparatus for Transporting Clean or Prepared Cover-slips.* — 

 A. Hinterberger has found, from practical experience, that cover-slips 

 may be sent by rail or post without danger of damage or contamination 

 by placing them in a glass trough, similar in shape and construction to 

 those used for staining and other purposes. Fig. 130 shows the apparatus 

 and also cross-pieces which enable two slips to be packed in each section. 



Fig. 130. 



Fig. 131. 



Fig. 132. 



The author goes on to mention what he has found to be a time- 

 saving device for examining several cultures simultaneously. Figs. 131 

 and 132 represent a couple of rectangular cover-slips from which one or 

 three corners have been removed. By making drawings of these on 

 paper, and noting at what corner a film has been deposited, it becomes 

 possible to fix and stain simultaneously on one cover-glass several 

 cultures. 



* Zeitschr. wiss. INIikrosk., xxiv. (1907) pp. 145-7 (2 figs.). 



