for tJic Microscope. 1 1 5 



than appreciated. Not at all uninteresting as a micro- 

 scopical object. 



968. ORANGE SCALE (Lecanium Hesperidutii). Elon- 

 gated scales, attached to the rind of oranges, are the re- 

 mains of the female of this species, with the eggs and, at 

 length, the young ones beneath. 



969. MEALY BUG (Coccus adoniduni) is well known 

 in hot-houses, attached to vines and other plants. It is 

 reddish, and covered with a mealy substance, whence its 

 popular name is derived. 



970. POTATO SPRINGTAIL (Smynthurus Solani). Very 

 small Podura-like insect, found leaping about potato-leaves 

 in July. 



271. TURNIP APHIS (Aphis raja:). The commonest of 

 the plant-lice which infest turnip crops, of which there are 

 three or four species. 



972. PEA APHIS (Aphis pisi). Sometimes very plen- 

 tiful on plants of the garden pea. The number of species 

 of Aphis is almost a legion. 



973. BEAN APHIS (Aphis f abas). The blackish plant- 

 louse infesting the field and garden bean, too well known 

 to farmers and gardeners. 



974. HOP APHIS (Aphis humuli). The insect usually 

 found on the hop plant is this species of Aphis. Both 

 winged and wingless Aphides should be examined. 



975. SNOUT BEETLES (Apion sp.). Almost every dry 

 stem of a herbaceous plant will, in the autumn, furnish 

 small beetles of this genus. 



POLARIZING OBJECTS. In order to render this cata- 

 logue more complete, we enumerate a selection of these 

 objects. The crystals are difficult for an amateur without 

 experience to prepare for himself. 



976. FINEST INDIA MUSLIN. The interlaced fibres of 

 cotton polarize beautifully. 



977. SOLE SCALE, or any characteristic fish-scale. 



978. SECTION OF GRANITE is one of the most interest- 

 ing of this class of objects. 



979. WHALEBONE. A thin section, either oblique or 

 longitudinal. 



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