Ss pe (7, U. S. DEPARTMENT OF AGRICULTURE 
of a Sho impervious paper. When this was ascertained it consti- 
uted a basis for any study of particular papers and methods of 
applying them which seemed desirable. 
As stated on page 18 of Technical Bulletin No. 75,2 certain methods 
of using mulch paper are patented. The present licensees are the 
Paraffine Companies (Inc.), of San Francisco, Calif.; Bird & Son - 
(Inc.), East Walpole, Mass., and Chicago, Tl. - and The International 
Paper Co., 100 East Forty-second Street, New "York, N. Y.. So far as 
these investigations show, any impervious dark paper free from 
soluble toxic materials may be as efficacious in stimulating plant 
growth as that manufactured especially for use as a mulch. 
The successful application of paper mulch in other regions has 
been brought about only through modest initial trials annually ex- 
tended as more information was obtained. ‘There appears to be no 
reason why the present inquiry regarding the attractive possibilities 
of this system should not be extended i in a » similar manner. 
2Frint, Lb. H. Cp. cit. 
ADDITIONAL COPIES 
OF THIS PUBLICATION MAY BE PROCURED FROM 
THE SUPERINTENDENT OF DOCUMENTS 
U. 3S. GOVERNMENT PRINTING OFFICE 
WASHINGTON, D. C. 
AT 
5 CENTS PER COPY 
V 
