120 



FRUIT CULTURE UNDER GLASS. 



comes elongated towards laying-time, and there can be easily 

 seen one, two, or sometimes ttiree eggs, in a more or less mature 

 state. 



" The egg sometimes retains its j'ellow colour for one, two, or 

 three days after it has been laid ; more often, however, it changes 

 to a dull-grey hue. From five to eight days generally elapse 

 before it is hatched. The duration of this period depends a good 

 deal on the temperature. The quantity of eggs, and the rapidity 

 \?ith which they are produced, are probably determined by a 

 variety of circumstances' — ^the health of the insect, the quantity 

 of nourishment it is able to obtain, the weather, and perhaps 

 other causes. A female which had produced six eggs at eight 

 o'clock A.M. on the 20th of August, had fifteen on the 21st at four 

 P.M. — ^that is, she laid nine in thirty-two hours. Other females 



Phylloxera vastatrwc (J. B. Planohon).— Female specimens and their egg. a 

 d, antennte; 6 &, horns or suckers; c, egg plainly visible in the hody of the 

 insect ; /, winged form of the insect. All greatly magni&ed. 



lay one, two, or three eggs in twenty-four hours. The maximum 

 quantity- is thirty ia five days. The eggs are generally piled up 

 near the mother without any apparent order, but she sometimes 

 changes her position so as to scatter them all around her. They 

 have a smooth surface, and adhere lightly to each other by means 

 of a slimy matter which attaches to them. 

 " Hatching takes place through an irregular and often lateral 



