330 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



quite independent of their Microscope, M. Malassez has arranged (fig. 57) 

 a heavy foot and a parallelogram holder (the same as in fig. 56), which 

 terminates in a toothed wheel engaging in an endless screw fixed on the 

 foot. By turning this screw the parallelogram can be raised or de- 

 pressed, and thus the loup can be mechanically adjusted. 



B. Technique.* 



(1) Collecting: Objects, including- Culture Processes. 



Sand-Filter for Agar.f — Th. Paul has found that sand is an excel- 

 lent material for filtering agar. He has devised a sand-filter, tho con- 

 struction of which is as follows : — The apparatus consists of a couple of 

 enamelled iron vessels, one of which fits on the top of the other (see 

 fig. 58). The bottom of the vessel is sieved, and this vessel contains 

 five strata of gravel and sand ; first, coarse and fine gravel, then sand, and 



* This subdivision contains (1) Collecting Objects, including Culture Pro- 

 cesses; (2) Preparing Objects; (3) Cutting, including Imbedding and Microtomes; 

 (4) Staining and Injecting; (5) Mounting, including slides, preservative fluids, &c. ; 

 ((>) Miscellaneous. 



t Munch. Med. Wochenschr., 1901, No. 3. See Centralbl. Bukt., 1" Abt., xxix. 

 (1901) pp. 270-1 (1 fig.). 



