Pakt III.] R. S. Hole : Useful Exotics in Indian Forests. 19 
actively may render unusually high temperatures innocuous, while 
absence of drying winds may greatly decrease the damage done in cold 
seasons when the soil temperature is low. Again, species which grow 
well in a humid climate on light soils may do equally well in a drier 
climate on heavy soils. 
Difficulties will no doubt arise and mistakes will no doubt be made, 
but if due care is taken it should be possible to prevent a number of 
mistakes which have occurred in the past (such as in introducing hygro- 
philous evergreen species into xerophytic localities where damage by 
frost and drought is frequent), and thus to prevent a considerable waste 
of time and money. 
10. Since 1908, this office, at the 
instance of the Government of India, has arranged with the co-operation 
of local Forest officers for the supply of such seed of our indigenous species 
as may be indented for by British Colonies, Foreign Governments, Insti¬ 
tutions, etc. It is hoped that, in return for such seeds, the information 
under paragraph 8 (YI) above, required by local Forest officers who are 
interested in this subject, may be obtained from foreign correspondents 
regarding valuable exotics and the conditions which are most likely to 
suit their growth. Since 1908 a quantity of seeds of our indigenous 
species has been supplied through this office to various parts of Africa, 
Mauritius, Europe, United States of America and the Philippines. 
11. With regard to the present paper, 
the writer is indebted to the Forest officers in the different Provinces for 
information regarding the various exotics cultivated in recent years and 
also to Mr. A. C. Hartless, Superintendent of the Government Botanical 
Gardens, Saharanpur, for information regarding the introduction of 
Frosopis julijlora and its growth at Saharanpur. 
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