488 



Handbook of Nature-Study 



Method — Ask the pupils to bring in all the spider egg-sacs that they 

 can find. Keep some of them unopened, and open others of the same 

 kind, and thus discover how many eggs are in the sac, and how many 

 spiderlings come out. This is a good lesson for September and October. 



Observations — i. In what situation did you find the nest? How was 

 it protected from rain and snoAV? To what was it attached? 



2. Of what texture is the outside of the sac? Is the outside made of 

 waterproof silk? AVhat is the texture of the lining? 



3 . How many eggs in this sac ? What is the color of the eggs ? When 

 do the spiderlings hatch? Do as many spiders come out of the sac as 

 there were eggs? Why is this? 



The egg-sac of the large, black and yellow garden-spider suspended for 



the winter in a branch of golden-rod. 



Photo by Slingerland. 



