34 
THE ENTOMOLOGIST’S WEEKLY INTELLIGENCER 
one couple. If the population of Ger- 
many be taken at 45 millions, this 
would allow ten million pounds of silk 
to each individual (5,000 tons!) 
Such is the effect of the geometric 
progression obtained by the rapid gene- 
ration of these prolific insects. The 
space required to accommodate so many 
larvae, the amount of food they would 
daily consume, and the number of acres 
that would need to be planted with the 
castor-oil plant ( Ricimis communis ) are 
not given ; the erudite German contents 
himself with saying that “ neither land 
nor labour could be spared to furnish 
the immense supply of vegetable matter 
which would be required for that pur- 
pose.” 
The Entomologist’s Weekly Intel- 
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