, 
GO. 
9 
devastated by the grubs of noxious insects, and overwhelmed 
by the insects themselves. Mr. Fred Enoch told us at Harro- 
gate recently that Professor Huxley had calculated that if a 
single pair of green flies were allowed to multiply unchecked, 
their progeny would in a single year equal in weight, in werght 
mind you, the whole of the population of China! He gave 
us the volume and page of the Ray Soctety’s Transactions 
where this statemnt is made and published, and how he made 
the calculation. This in itself is surely sufficient to prove how 
necessary it is to protect our insect-eating birds. We know 
too, how soon small mammals can increase and multiply. A 
rabbit a year old is generally a grandfather, and mice and rats 
increase even more rapidly. Jf they were not kept in check by 
the birds that prey upon them fand we must also give stoats 
and weasels a good deal of credit in this direction), thev would 
-soon over-run the land. 
(To be continued). 


Ol 
YORKSHIRE HAWKWEEDS. 
JOHN CRYER. 
Tue following is an additional list of Yorkshire Hawkweeds 
to that published in this journal, April, 1909, and February, 
1910. J am deeply indebted to the Rev. E. F. Linton, M.A., 
for his generous help and for his copious and critical notes. 
H. anglicum Fr. var. Brigantum F. J. Hanb. Linton, 
Ghaistrills, Bastow Wood, near Grassington. New localities. 
H. lastophyllum Koch. var. euryodon F. J. Hanb.—Cronkley 
Scars, Teesdale. New to North Riding and to Yorkshire. 
Found by the writer, July 6th, 1913. Mr. Linton: says: 
‘Correct, though slightly different in the clothing of the 
involucre from other forms of the variety.’ 
H. britannicum F. J. Hanb. In abundance in Ling Gill. 
The only other recorded Yorkshire locality is Linton, near 
Skipton. 
H. scoticum F. J. Hanb. Ling Gill and Littondale. This 
was first recorded for Yorkshire by T. A. Cotton in 1892, who 
found it at Deepdale in Upper Wharfedale. Two or three 
plants were seen in Ling Gill, but it was fairly abundant in 
Littondale, August, 1913. 
H. stenolepis Lindeb. Mr. A. Ley in Supplement of Journal 
of Botany, January, 1909, page 5, says: ‘ No form of H. steno- 
lebis appears to occur in Yorkshire.’ The writer found several 
examples of type in Heseldon Gill, June 26th, 1915. 
H. pellucidum Laestad. Hackfall Woods, near Tanfield, 
June 7th, 1913. A new station for it in the north Riding. 
1916 Feb. 1. 
