ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



657 



A. This screw will serve to give solid fixing to the razor support as 

 the old type of raising gear. The support itself will be guided in its 

 movements by the piece B (figs. 155 and 156), on which it rests, and the 

 two little fillets r, r' will amply fix it. The plate B will be itself 

 guided by the said lateral movement by the two fillets R R' of the 

 plate A, between which it will be placed. An inspection of fig. 156 

 will show the method of operation. 



The lateral displacement in regard to the object will be effected by 

 gliding this support in the direction of the arrow towards the desired 

 spot. The two fillets r, r of the support will engage the plate B, 

 which, itself engaged by the fillets R, R of the plate A, will thus have 



Fig. 156. 



a direction strictly parallel to the axis of A. The screw of the raising- 

 gear V, retained and engaged by the transverse bar T of the support as 

 well as by the hole F of the plate B, will perform all the movements 

 communicated to it by the two pieces. The rectangular hole in A is of 

 such dimensions that it does not interfere with the stem of the screw in 

 this displacement. The older form of movement is not, however, 

 obviated, for when B has arrived at the end of its course the usual 

 antero-posterior displacement of the support will ensue, and can lie 

 used if desired. The author has had the Minot microtome more 

 particularly in view, but with some modifications his design could be 

 adapted to other types of instruments. 



Celloidin Imbedding.* — L. Neumayer has obtained excellent results 

 by carrying out the various stages of the impregnation in exsiccators 



* Zeitschr. wiss. Mikrosk., xxv. (1908) pp. 38-41. 

 Oct. 21st, 1908 2 X 



