TABLE OF CONTENTS, VOLUME V, 1918 
No. I, January 
PAGE 
"fhe effect of illuminating gas and its constituents on certain 
bacteria and fungi C. A. Ludwig i 
A bacteriological method useful for the study of other micro- 
organisms (with two text figures) . . . .Freda M. Bachmann 32 
The development of some exogenous species of Agarics (with 
plates I- VI I) Gertrude E. Douglas 36 
No. 2, February 
The structure of the uredinium in Pucciniastrum Agrimoniae 
(with plate VIII) C. A. Ludwig and C. C. Rees 55 
Spore formation in Philocopra coeruleotecta (with plates IX-XI) 
Hally J olivette Sax 61 
Selected cycles in Gymnoconia peckiana . . . George F. Atkinson 79 
Aspergillus fumigatus, A. nidulans, A. terreus n. sp. and their 
allies (with three text figures) 
Charles Thom and Margaret B. Church 84 
No. 3, March 
A demonstration of photosynthesis (with two text figures) 
W. J. V. OSTERHOUT 105 
The flavones of Rhus Chas. E. Sando and H. H. Bartlett 112 
Conservatism and variability in the seedling of Dicotyledons 
(with four text figures) Edmund W. Sinnott 120 
Noteworthy Lejeuneae from Florida (with five text figures) 
Alexander W. Evans 132 
No. 4, April 
Copper and zinc as antagonistic agents to the "alkali " salts in 
soils (with two text figures) 
C. B. LiPMAN and W. F. Gericke 151 
The effect of tobacco smoke and of methyl iodide vapor on the 
growth of certain micro-organisms C. A. Ludwig 171 
iii 
