158 
number of larve taken, and the number of insects resulting 
from them. 
LARVA. IMAGINES, 
TOOQ20 0 pace 485 58 ays 338 
IYO} Moe 894 ob6 oe 714 
TSO4, see 1328 oe ae 1057 
EOO5, 5: 15608 Ago se 1250 
SOON =e 1102 ara be 882 
LOO 7am ia: 660 et ee 530 
‘* The falling off in the number for the last two years is due 
to advancing years and ill-health. The result in varieties 
was simply astonishing. I must now explain the locality. 
In Clifton and Redland are a vast number of roads bordered 
on each side by private houses, villas, &c. Nearly all have 
a small garden in front of the road. On the side close to 
the footpath each house has a wall about two feet high, 
with rails inserted. Here are the shrubs of Euonymus. 
There is scarcely a garden without one or more of them. I 
should be afraid to guess the number of miles I must have 
walked in going up and down those roads, peering into these 
shrubs, to the astonishment alike of the owners and the 
numerous onlookers on foot and in vehicles. During the 
last two or three years I have become so well known that 
my proceedings create no surprise, and I am generally 
regarded as a harmless lunatic. I must not forget to say 
that all my larve were taken within two miles from my 
house. I will ask you to remember this, as it bears upon 
the few remarks which follow as to the ‘ cause’ or causes of 
these ‘varieties.’ I have read hundreds of pages (I might 
almost say thousands) on this subject. It must be dis- 
tinctly understood that I mean varieties pure and simple— 
not such aberrations from the type as have perpetuated 
themselves, and are called ‘local’ forms. Multitudinous 
have been the conjectures, suggestions, and arguments as to 
the cause or causes of such variation. The chief, I think, 
are ‘food, ‘light,’ ‘or ‘darkness’—that is ‘too much or 
too little of either,—-‘ temperature,’ ‘smoke,’ ‘soil’ on 
which food-plant grows, ‘wet and dry,’ too lhttle or too 
much, &c. I attach no value to any of these ‘ conjectures,’ 
‘ suggestions,’ or ‘arguments’ for the following reasons. 
By employing any of the above-mentioned can the collector 
assure himself of a ‘‘ variety”? ? I think no one will assert 
this. I am ready to admit that, by the employment of 
unusual heat or cold, there may be a reasonable hope of 
