INSTRUCTION TC SCIENCE TEACHERS. 685 
as about the size of a pea are transported carefully packed in bas- 
‘white wax tree,” which 
they-are purchased at about twenty taels per basket. The trees 
by the middle of March have thrown out a number of long 
tender shoots and leaves, and then the clusters of eggs enclosed 
in balls of the young leaves are suspended to the shoots by strings. 
About the end of the month the larve make their appearance, feed 
on the branches and leaves and soon attain the size of a small 
caterpillar or rather a wingless house-fly apparently covered with 
white down, with a delicate plume-like appendage, curving from 
the tail over the back. So numerous are they that as seen by me 
appear as if covered with feathery snow. The grub proceeds in 
July to take the chrysalis form, burying itself in a white wax se- 
cretion, just as a silkworm wraps itself in its coccoon of silk. 
wax is skimmed off and run into moulds in which shape it is 
exported to all parts of the Empir 
It wou 
and hence the necessity of importing the eggs from Yunnan. In 
eggs is alone attended to, both frost and snow is experienced, 
so that it would not be difficult to rear the insect in Europe, anc 
considering its prolific nature, the production of white wax might 
repay the trouble of acclimatizing this curious insect.” 
INSTRUCTION TO SCIENCE TEACHERS AT SOUTH 
KENSINGTON. 
Durme the months of June and July, a number of science 
teachers from various parts of England, Scotland, and Ireland, 
were assembled in London, for the purpose of attending special 
classes, arranged for their instruction under the auspices of the 
Science and Art Department. We propose to give some ac- 
count of the course of instruction in the principles of Biology 
