?6 MitMiLtiOK, A Micnucope fur rfa XntuniHsi [ y^L^ 1 



(iv) Stand; Tlic mtwt suitable U a Wcitham Binocular, not ttn^y mace 

 but sometimes ava.labte secondhand. Since the Wenham Binocular was 

 originally made tor Jong rube lcitsca, it would be well to ace that modern 

 liiglt power louse* kvcrc corrected for uiK* win o long tube. This is done by 

 means at a correcting lens or alteration to the objective* but on. tw acctjitHt 

 ibocM an amateur attempt to alter the lense* himself as this i«. a job for 

 tbc e>i>Cfl PcnVianeut damage can result by even unscrewing the objective 

 for cfettrmg or (toy other purpose * 



If the lenses purchased with rhe microscope are the originals, no Correci»On 

 will he necesscuy. but t^cy ahcutd he tested carefully by an expert at old 

 lenses saracriiMH deteriorate. 



1j the choice is limited to a modem instrument, jiUrebase a. sUjkI that can 

 be built up by the addition of a mechanical stage, a rack focussing and 

 conterin^ si<b-vt*fcie and a binocular body, 



Only a few medical stnden*V, miefuicoiies £aj| be bu;li u(» m th«$ way, 



IS you have any further queries I would be happy to answer them 



NOTES ON THE ARMY WORM 



By Rr.x C. Km 1 1 aW 



The Southern Army Worm, Pcrsntmiia cminyii ( VVestw.) ha* caused 

 considerable damage to pastures and crop* Hi Ta^mnma in tecent yean. 

 During the present season CiySS/.Sb) ihe writer has observed the cater- 

 pillars feeding on" years in a West Tamac o-'chard. 



The tooths are m flight during September and October, and caterpillars 

 ascend the plant stems where ihey ievd 011 the seed heads duruttf November 

 jud December. Infestations have reached plague proportions in some years 

 and considerable economic damage has resulted. Marlyn $1955) » coord* 

 mutual d^magre co the wheat variety "Magnet'', and most crops have been 

 infected 10 varying degrees Damage to pears in a West Tamar orchard 

 also seems UOTUStlSl and the writer has not noticed a pTior reference tn y.Kh 

 an occurrence. 



Round holes were noticed in pears, principally of the Winter Cole variety, 

 which at first sighs could have been taken for hail marks. On close inspection 

 numbers of caterpillars were observed m sUu-. Infestations of the glasses ot 

 the orchard had been noticed, and :t is possible that the caterpillars inoved 

 mto the ttees rfUbi?%Wfltrt to the cultivation of the orchard. However, a? the 

 object of tlit cultivation was to produce a mulch and not to eliminate the 

 c;rass, there was still a goodly amount available standing for the caterpillar* 

 to icc<\ on. This was not beavdy infested at all so apparently competition Was 

 not an important reason for the movemen; j moreover there were sometimes 

 three or tour caterpillars on a very small pear. 



Close observation was made, oi the activity ot" the caterpillars, ami it was 

 noted that individuals moved from nUcc 10 plaoc on a pear until a iitc 

 Mutable for attach was found. The skin was then rtmoved in small quantities 

 by a eitawing motion, and from time to time was placed to one side and was 

 not eaten. The skin was removed fiom a eoufehly circular vetch, subsequent 

 to which the caterpillar began to eat the fruit. A rounded hole rather larger 

 than the brifciuaf opening was excavated, the caterpillars not digging deeply 

 itrtG the irilit a* do the codlin moth larvae. 



Ill the case oi the WlPfcl Cole pears the damaged Iru.l may be removed 

 during normal fruil thinning operations, but with otftcr varieties not 

 normally requiring thinning the low is an economic factor. Most damage 



• iueh un.'iCKWutC of objectives wjh. stitfjcyied { rt a;t .irilclt on "Olean'n* Mitfionnve 

 t.cnse/ m 'h-» Jo.irnxl ln>( inomh l.Kuf. A'al f3> (0,1. TK«re v/dl be UOQihOlC^I l» h 

 foHhtaoQPft l ?VH a " Arlitk on th* C£Airirtg of lci^cS in W ohj^liw. — Erfiior. 



