722 PALEOBOTANY 



fraction, leaving a sample rich in pollen grains. Make up the 

 residue with lacto-phenol stained with methylen blue, and place 

 a definite volume for counting in a specially made chamber of the 

 type of a blood-corpuscle counter. 



1419. See also Docturovsky, Reports on Peat, iii, 1914 (Russian, 

 French summary) ; Rudolph and Firbas, Ber. Deutsch. Bot. 

 Ges., xl, 1922, p. 393 ; Stark, Zeits. Bot., xvii, 1925, p. 89 ; 

 Gams, Zeits. Gletscherkunde, xv, 1927, p. 161 (who gives a full 

 bibliography) ; Sears, Bot. Gaz., Ixxxix, 1930, p. 95. 



