ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



469 



pulley of wood is fixed to a washer n C, soldered to a piece of the same 

 copper tubing o, which is fixed to the shaft by a pin. 



The apparatus can be placed in an incubator, e.g. that of Roux No. '1 



A 



<d 



1AI 



f 



m" 



<j 



M hi 



^d 



d 



j i 



i 1 



'J 

 \ ft - 







H 



rwM^ 



m 



m 



cc 



L-. 



J i__J l I 



3 cm 



i i i i I i i i i I i i i i t i i i i I i i -i i I 



5 JO to W J5 cm 



Fig. 74. 



model of Weisnegg, the shaft projecting from one of the aerating 

 apertures, and the pulley being thus outside. Movement is supplied 

 bv means of a turbine or small electromotor. 



