266 



Mycological Bulletin Nos. 67 and 68 



[Vol. IV 



Quotations from Duggar's Bulletin on the Principles of Mush- 

 room Growing and Mushroom Spawn Making: 



The conditions under which mushrooms may he successfully grown 

 are limited, and intelligent attention is therefore essential. It must be 

 said, moreover, that the majority of failures may be directly traced to 

 erroneous ideas as to the cultural requisites, or to a reckless disregard 

 o: conditions. The essential conditions will be subsequertly defined in de- 

 tail, but it may be stated here that failures are usually due to one or 

 more of the following causes: (1) Poor spawn; (2) very poor manure; 

 (3) unfavorable temperature; and (4) heavy watering during the early 

 stages of growth. 



Under suitable conditions mushrooms may be grown with assurance of 



I'ig. :i().'>. .\( ARicr.s vii. atici's. A promising spcciis, fleshy and pn lific. Krom 

 Bulletin No. 8.'i, P>. M. Dupgar, Hureau of Plant Industry, U. S. Uepart- 

 meiit of ARriculture. 



success. Ordinarily they are grown only where the conditions may be 

 controlled, and success should therefore be invariable. 



In many cases it has been possible to obtain growth from the spores 

 by the use of the stimulating salts which have been mentioned in con- 

 nection with the pcrmii ation studies. Where it is desired to make ex- 

 periments alorg this lire the writtr has found it more practicable to 



