75 



at tlie bottom, nothing but such worms 

 as I have represented in fig. 13. He ob- 

 served that the tuft of grass was somewhat 

 withered in tlie cellar, and as he guessed 

 that the worms took their nourishment 

 from it, he changed it for a fresh one. 



Through the autumn his worms in- 

 creased remarkably. He put the glass 

 again in the cellar for the winter, and on 

 the approach of the spring, he took it out 

 again that the tuft might keep green. 

 In May, or some time later in summer, 

 when the worms were near a twelvemonth 

 old, they were of the size of fig. 14. and he 

 was now obliged to give them a green tuft 

 every second or third day. When this 

 was no longer sufficient for them, he took 

 some pots, sowed peas, lentils, andsallad in 

 them; andafterthe youngplantsw^erecome 

 out he put them in these pots that they 

 might findnourishmenton the youngroots 

 of these plants, but in order to let them 

 have sufficient, he could not put in more 

 than one or two worms in each. In tl;is 

 manner he kept them till the second year, 

 after which they were the size of fig. 15. 

 E 2 



