456 General Notes. [ April, 
either to the temperate or the southern fauna in those regions. It 
wiil naturally be asked, to what race can the river-drift man be 
referred? The question, in my opinion, cannot be answered in 
the present stage of the inquiry, because the few fragments of hu- 
man bones discovered along with implements are too. imperfect to 
afford any clue. Nor can we measure the interval in terms of 
years which separates the river-drift man from the present day, 
either by assuming that the glacial period was due to astronomi- 
cal causes, and then proceeding to calculate the time necessary for 
them to produce their result, or by an appeal to the erosion of 
valleys or the retrocession of water-falls. The interval must, 
however, have been very great to allow of the changes in geogra- 
phy and climate, and the distribution of animals which has taken 
place—the succession of races, and the development of civilization 
before history began. 
MICROSCOPY .! 
re 
sulted in intra-cellular derangements. Parallel trials were í ag 
fore made of picric acid, osmic acid and iodine, three differen Be 
lutions of each being made; one in distilled water, one in alco s 
and another in sea-water. The solutions in distilled water 3 
alcohol proved almost worthless in each case, while eac eir 
solutions in sea-water gave good results. It was found, curious" 
enough, that the protoplasm of the cells was more easil 
than the nuclei and karyokinetic figures. ; water 
Solutions of osmic acid and corrosive sublimate in ed as 
gave good preparations, but the iodine solution was regard 
the best (re-agent). jodine, 
y injured 
A few drops of a saturated alcoholic solution of | 
_ 1 Edited by Dr. C. O., WHITMAN, Newton Highlands, Mass. 
: : -$ 
(2 Pringsheim’s Jahrbücher für wissenschaftliche Botanik. Vol. a pP TE 
4 
