e 
y Ed 
MIDLAND NATURALIST. 53 
and P. oedipus being infested by a Nematode which he called 
Rhabditis te»ricola Duj. "The form according to Coemans, is com- 
mon in decaying substances and not of rare occurrence in the above 
named species. He cites references to previous observations upon 
the subject by Persoon,t Currey,{ and Ehrenberg §. Illustrations of 
the worm and its work supplement the text || and lead to the con- 
clusion that the species under observation is identical with that 
studied by the older authors. 
Material from this culture was sent to Dr. C. W. Stiles of the 
Public Health and Marine-Hospital Service for identification. He 
reported that only larvae could be found and as no adults developed 
after a considerable period of observation he concluded that the 
species was parasitic upon the horse. 
The papers cited above contain a discussion as to the relation 
of the worm tó the fungus but only conflicting conclusions are 
reached ; nor have we any theory to advance to explain the oc-- 
currence of the worms within the sporangiophores of the mould. 
Upper lowa University, Fayette, Iowa. 
Obs. Myc. 1:77. 1796. 
Jour. Linn. Soc. London 1:166. 
Kuntze and Schmidt, Myk. Hefte. 2:67. 1823. 
Pi 21, A49 C.D. 
ree 
Microscopy Notes. 
II. A CONVENIENT FIELD MICROSCOPE. 
By JOSEPH A. MARTIN. 
The ordinary type of instrument advertised by optical com- 
panies, as a compound field microscope, such as designed to collect 
microscopic plants has many objections to its adoption for general 
use, especially because they are expensive and inconveniently con- 
structed. 
In gathering material or objects, such as algae, it is very 
essential for one to know whether or not the materialis in favorable 
condition before leaving the field ; for if left to be examined in the 
laboratory later and then found to be worthless loss of time results. 
On returning the following day it is not likely that one will find the 
Pe 
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