hs] CURRENT LITERATURE 287 
A notable host index. 
Waat DeCandolle's Prodromus did for the systematic study of sperma- 
tephytes, Saccardo’s Sy//oge has done for the study of fungi. In the eleven 
heavy volumes of this work all species of fungi described before 1895, over 
_ fty-two thousand, have been displayed, with synonyms and geographical 
_ Ssmbution. In 1897 an index to genera and species, prepared by Dr. 
q Sydow, was issued, forming volume twelve of the work. And now we have 
: the first part of volume thirteen,’ compiled by the same bibliographer, index- 
a Mg the work by hosts. The typographical features of the volume are of the 
_ Ms. The name of the host is printed in bold-faced type, and the names 
the attendant fungi are given beneath in a single column. The clear- 
os the simplicity of the arrangement leave nothing to be desired. 
‘ th the issuing of this volume the mycologists of the world are placed 
_ ‘Mider a further debt of gratitude to the promoter of the work.— J. C. A. 
Fundamental problems of science.° 
T i * . . 
ae = OK Is an attack upon the theory of so-called scientific material- 
— S@, written b 
of these two Propositions Dr. Wagner is at one, not merely with prac- 
oe ent of philosophy, but also with many, perhaps the majority 
lists of today. Even the drudge, whose ideas never rise above 
on hig “Pasting, has had the problem of the real nature of matter forced 
; ass Source of knowledge, and that therefore the only direct infor- 
on nf hature of the constituents of the external world is given by 
Main forces “coming and going of these sensations reveal the existence of 
Ril wy, * Fr perhaps a single force, to whose activity they are due, but 
© can jum d : f 
CS as P out of our own skins we can have no idea of the nature 0 
they are in themselves, Annihilate the conscious subject, and 
loge fungorum omnium hucusque cognitorum. bb ae 
"i P, Sydow. 
* PP. I-624.] Berolini: Fratres Borntraeger. 1696. ; : 
eed, Mites. LF.—Grundprobleme der Naturwissenschaft. Briefe oe 
le Orschers, 8 ses : Berlin: Gebriider 
tiger iy. iy ‘ vo. pp. viii 255. [No index. ] 
