125 



GRAPE-VINE TOMATO-GALL. 



I,<i.ti<i]ik'ra ritiK (). S. 

 Model in wax of tlio almonnal growths on tt'iminul twi^^-^ of tho 

 j^Tiipo, caused hy the stinjjf of a littlo <;iiat. 



GRAPE-VINE PHYLLOXERA- GALL. 



riti/llo.iint nixtiilri.r IMaiicli. 



IVIodol in wax of tho <^alls produced ])v the h'af foiin of the j^rape 

 Phylloxera, showinu' tlunr cliaraeteristic appearanct^ and disposition on 

 the loaf. 



SOCIAL GRAPE CATERPILLAR. 

 IldnisiiKi (tmcricdiKi llari'. 

 Twi»;s of t.rapo-vino modeled in wax, showiiiii' the characteri.stic 

 appearance and work of tho larva' and their method of feeding in 

 imiform rows on the loaf. 



THE GRAPE-SEED WEEVIL. 

 Crapoiiins in:v(jit(tliH iSay. 

 A 1)unch of grapes, showing damage to the l)orries 1)}' the larva* of 

 this insect; also punctures made by the female beetle in oviposition. 



THE SILKWORM. 



Boinbijx {Sericaria) mori Linn. 



Enlarged model of the larva, showing its complete anatomy; the 

 nuisoles, nerves, tracha\ viscera, the silk apparatus in its whole extent, 

 the silk-secreting gland, and tho gland discovered by Auzoux, which 

 secretes a liquid, the use of which is most proba))ly to convert the 

 silky matter into insoluble threads. In one of tiie piolegs may be 

 seen the muscles which move the claws and sucking disks which enable 

 tho animal to walk with its true feet in the air. 



Enlarged models of the moths, male and female. In each model is 

 shown tho atrophy of the digestive tube and tho development of the 

 marvelous organs by which thespecies is perpetuated. (After Auzoux.) 



HOP PLANT-LOUSE. 



I'lturutliiit Iitnnali Schr. 



Unaffected I lor Plant. — A spray of hops, modeled in wax. repre- 

 senting the i)lant as it appears in vigorous growing condition, and free 

 from the attacks of its principal enemy, tho hop plant-louse to con- 

 trast the stronger foliage and tho more abundant and larger hops 

 produced by plants from wiiich tho hop lou>e has been eradicated by 

 the use of proper remedies. 



Affected Hot Plant. \ spray of hops modeled in wax. repre- 

 senting the vine as it appears when attack«'d by tho ho[) plant-louse, 

 showing tho blackening and discoloration of tho loaves and tho small 

 and inferior hops which are also discolored and otherwise unsuitable 

 for market. 



