1903 No. 11. MYKOLOGISKE UNDERS. OVER SOP PAA FURUSP. LARVE. 9 
sicht«, welche auch Bolle betont, »dass die Bacillen bei der Schlaffsucht 
nur eine nebensächliche und sekundäre Rolle spielen, und dass die Pebrine- 
körperchen, die ich seiner Zeit auch bei meinen Nonnenraupen zu finden 
glaubte, die Hauptursache seien.« 
Det fremgaar heraf, at ogsaa Eckstein er kommen til et negativt resultat 
med hensyn til bakterierne. Hans resultater er jo ikke meget opmuntrende, 
men han gjør i et andet arbeide opmerksom paa, at hans forsøg med 
mugsop muligens har været udført med en ikke virulent sopform. 
I Amerika tilskrev jeg ogsaa en række forskere, hvoraf følgende neden- 
staaende har svaret mig saaledes: 
7 Scott St. Cambridge. 
Jan. 3. 1902, 
Dr. Olav Johan-Olsen, 
Kap ved Mjøsen, Norway. 
Dear Sir. 
Your letter of Dec. 11. reached me in due season and should have 
been answered sooner had I not been away the past week. I am sorry 
that I have not at the present moment any cultures of Entomogenous 
fungi in my laboratory except a few forms of Cordyceps which, from 
their slow growth and scanty spore formation, would not be of any 
service to you. I have never done my work on the economic application 
of these forms and have never believed that such work would prove of 
practical value in the field except under speciel conditions. Though I have 
done a good deal of work on the fungus parasites of insects I have never 
published anything on the economic aspect of such diseases. There has 
been a good deal of experimentation in this country with such forms 
especially with Sporotrichum globuliferum, but the results to my mind are 
of no great value. 
Prof. S. A. Forbes of Champaign Ill. has done a good deal of work 
in this direction and I have asked him to send you any literature that he 
can spare. If you desire it I could no doubt get Sporotrichum for you 
another season and will do so if you wish. 
Very truly yours 
Roland Taxter. 
