This section is from the book "The Relation Of Food To Health And Premature Death", by Geo. H. Townsend, Felix J. Levy, Geo. Clinton Crandall. Also available from Amazon: Clean Food: A Seasonal Guide to Eating Close to the Source with More Than 200 Recipes for a Healthy and Sustainable You.
"Mushrooms are not used extensively in this country, because not much effort has been made to cultivate them and those found in the woods or field are difficult to gather, besides there is great danger of being poisoned by them. Some are even so poisonous that they will poison a person to handle them."
"They can only be distinguished by people who are familiar with them and have some knowledge of botany. There are three or four hundred varieties of edible mushrooms found in the United States, and the number of poisonous ones is also very large."
"The mushroon is very rich in nitrogen, tissue forming substance - perhaps more so than any known vegetable."
"Well, no doubt much more is charged to it than it deserves because it is usually eaten with other rich foods, but as it is usually fried this method of cooking would necessarily make it difficult to digest because the principle of frying tissue forming foods is radically wrong. Mushrooms, instead of being eaten with meat ought to supplant meat entirely whenever any considerable part of a meal is made of them."
 
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