1896.) Aqueous Media for Preserving Alge. 145 
Rhodophycea. The coarser forms may be put into any one 
of the three solutions and be in very excellent condition; 
chrome alum preserves more color than formalin or camphor 
water. For the finer study, specimens are best left in a con- 
centrated solution of picric acid in sea water for twenty-four 
hours, then washed, preferably in sea water, for about twenty- 
four hours more, and preserved in camphorated sea water. 
Such genera as Nemalion, Champia, Rhabdonia, Cystoclo- 
nium, etc., respond best to this treatment. Delicate species 
need very careful consideration. _Griffithsia Bornetiana is a 
most delicate species and, preserved in almost any way, col- 
lects itself together into a shapeless mass; the cells lose their 
shape, and it becomes a very uninviting object for study. 
true of various species of Callithamnion, such as C. Baileyi, 
er formalin or chrome alum will prevent this if the speci- 
Be are fairly fresh when put into the preserving solution. 
erkeley, Cal., and Providence, R. I. 
